Answer:
Atomic mass of Boron: 10.8 amu
Explanation:
Boron-10: (0.198)(10.013) = 1.98 amu
Boron-11: (0.802)(11.009) = 8.83 amu
Add them up: 1.98+8.83= 10.8 amu
There are 120.0 mL of O2 at 700. 0 mmHg and 15⁰ C. What is the number of grams present?
Answer:
0.1498 g of O2.
Explanation:
The Behavior of Gases => Ideal Gas Law.
The ideal gas law is a single equation that relates the pressure, volume, temperature, and the number of moles of an ideal gas, which is:
[tex]PV=nRT,[/tex]where P is pressure in atm, V is the volume in liters, n is the number of moles, R is the ideal gas constant (0.082 L*atm/mol*K), and T is the temperature in the Kelvin scale.
So we have to convert pressure from 700.0 mmHg to atm, volume from 120.0 mL to L, and 15 °C to K.
Let's convert pressure taking into account that 1 atm equals 760 mmHg, like this:
[tex]700.0\text{ mmHg}\cdot\frac{1\text{ atm}}{760\text{ mmHg}}=0.9211\text{ atm.}[/tex]Remember that 1 L equals 1000 mL, so 120.0 mL would be equal:
[tex]120.0\text{ mL}\cdot\frac{1\text{ L}}{1000\text{ mL}}=0.1200\text{ L.}[/tex]And the conversion from °C to K is just sum °C with 273, so 15 °C in K is:
[tex]K=\degree C+273=15\degree C+273=288\text{ K.}[/tex]Finally, we can use the ideal gas formula, solving for 'n' (number of moles) and replacing the data that we have, as follows:
[tex]\begin{gathered} n=\frac{PV}{RT}, \\ \\ n=\frac{0.9211\text{ atm}\cdot0.1200\text{ L}}{0.082\frac{L\cdot atm}{mol\cdot K}\cdot288\text{ K}}, \\ \\ n=4.680\cdot10^{-3}\text{ moles.} \end{gathered}[/tex]Now, the final step is to convert 4.680 x 10⁻³ moles of O2 to grams using the molar mass of O2 that can be calculated using the periodic table, which is 32 g/mol. The conversion will look like this:
[tex]4.68\cdot10^{-3\text{ }}moles\text{ O}_2\cdot\frac{32\text{ g O}_2}{1\text{ mol O}_2}=0.1498\text{ g O}_2.[/tex]The answer would be that there are 0.1498 g of O2.
when making soap, if 890 g of a specific fat react completely with 120 g of sodium hydroxide, the product formed are soap and 92 g of glycerin. calculate the mass of soap formed to satisfy the law of conservation of mass.
The mass of soap formed to satisfy the law of conservation of mass is 918g.
What is law of conservation of mass?According to the rule of conservation of mass, in a chemical process, mass neither creates nor destroys itself. When coal is burned, for instance, the carbon atom in it transforms into carbon dioxide. Although the carbon atom's shape changes from solid to gas, its mass remains constant.
The mass of the reactants and products in a chemical reaction must equal each other according to the law of conservation of mass.
Fat + sodium hydroxide = soap + glycerin
890+ 120 = soap + 92
1010 = soap + 92
soap = 1010 - 92
soap = 918g.
To know more about law of conservation of mass visit:
https://brainly.com/question/28711001
#SPJ4
When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond.
When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond nitrogen lone bond.
Lone pairs do they produce hydrogen bonds?Strong intermolecular interactions known as hydrogen bonds can develop between adjacent molecules. Between the covalently bound hydrogen atom of one molecule and the electron lone pair of a second molecule, hydrogen bonds are created.
Due to their strong electronegativity, only nitrogen, oxygen, or fluorine atoms may be used in this process. These three atoms have extremely high electronegativity, which makes it simple for them to draw the electron from the hydrogen atom and establish hydrogen bonds.
Atoms within a molecule are held together by intramolecular forces. There are forces between molecules known as intermolecular forces.
learn more about Lone pairs refer
https://brainly.com/question/25192438
#SPJ4
When a mycelium infiltrates an unexploited source of dead organic matter, what are most likely to appear within the food source soon thereafter?.
When a mycelium infiltrates an unexploited source of dead organic matter, Fungal digestive enzymes are most likely to appear within the food source soon thereafter.
A network of hyphae with fungal filaments is called mycelium. Although they can thrive in various habitats, such as rotting tree trunks, mycelia frequently grow underground. Mycelium can be produced by a single spore. Many fungi, including mushrooms, grow their fruiting bodies from mycelium. Mycelia are crucial to the health of the soil. They decompose organic matter, returning essential elements to the ecosystem as a result.
Fungal enzymes are active in an acidic environment that mimics the physiology of the human stomach. In vitro, fungi enzymes enhance the digestion of dietary fat, protein, and carbohydrates. The research of digestive deterioration with aging has been established using an adapted in vitro technique.
To know more about fungal enzymes visit the link:
https://brainly.com/question/1361836?referrer=searchResults
#SPJ4
The hydrochloric acid utilized in this experiment can often discolor gloves if it is spilled on them during use. If this does occur, what should be done in order to remedy this potentially hazardous situation?.
In order to remedy this potentially hazardous situation of Hydrochloric acid option b. put some sodium bicarbonate on the gloves so they can be neutralized.
Hydrochloric acid, additionally known as muriatic acid, is an aqueous answer of hydrogen chloride. it's far a drab answer with a distinctively smelly odor. it's far categorized as a robust acid. It is a part of gastric acid in the digestive structures of maximum animal species, which include human beings.
Hydrochloric acid (HCl) is generally used for the neutralization of alkaline marketers, as a bleaching agent, in the food, textile, metallic, and rubber industries. it's far neutralized if launched into the soil and it rapidly hydrolyzes while exposed to water.
Hydrochloric acid is a clean, toxic liquid. it is a caustic chemical and notably corrosive, which means it right away reasons severe damage to tissues, such as burning, on touch. this text discusses poisoning from swallowing or breathing in hydrochloric acid.
Learn more about hydrochloric acid here:-https://brainly.com/question/27576431
#SPJ4
Disclaimer:- your question is incomplete, please see below for the complete question.
The hydrochloric acid utilized in this experiment can often discolor gloves if it is spilled on them during use. If this does occur, what should be done in order to remedy this potentially hazardous situation?
a. Gloves are not needed in this experiment, this question is invalid.
b. put some sodium bicarbonate on the gloves so they can be neutralized.
c. Remove the glove and wash your hand prior to putting a new pair on.
d. wash the gloves off and continue to use them.
A sample of crystalline compound when heated in an open test tube, produced several droplets of water on the upper part of the test tube. When the residue is dissolved in water, a yellow brown solution is formed. In contrast to The colorless solution formed when a sample of the original compound is dissolved in water. what evidence would lead you to conclude that the compound is not truly hydrate
To be considered a true hydrate, a compound must follow a few rules, and one of these rules is the color being the same before and after heating. In this case we have a difference in the color, the residue after heating when dissolved in water is forming a yellow brown solution, and in the meanwhile, a colorless solution is formed when a sample of the original compound is dissolved in water, which is not a characteristic of a true hydrate.
Electrons from fadh2 are transferred to succinate reductase and then to a small organic molecule called?.
Electrons from fadh2 are transferred to succinate reductase and then to a small organic molecule called Ubiquinone.
Electron Transport chain?
The electron transport chain main job is to produce an electrochemical gradient. It propels the production of ATP during photosynthesis and cellular respiration in mitochondria and chloroplasts, respectively. Cellular respiration uses it.
Ubiquinone transfer electrons to Complex III from Complexes I and II as well as from other mitochondrial dehydrogenases by acting as an electron transporter in the mitochondrial respiratory chain.
To know more about electron transport chain visit the link:
https://brainly.com/question/24372542?referrer=searchResults
#SPJ4
Which solution of the following has the lowest freezing point?
A. 40g of KBr dissolved in 200g of water
B. 30g of KBr dissolved in 100g of water
C. 20g of KBr dissolved in 250g of water
D. 10g of KBr dissolved in 100g of water
Pls do reply this answer with proper explanation.
Based on freezing point depression, the solution that has the lowest freezing point is 30g of KBr dissolved in 100g of water; option B.
What is freezing point depression?Freezing point depression is a phenomenon that occurs when a solute is dissolved in a pure solvent such as water.
When a solute is dissolved in a solvent, the freezing point depression is calculated using the formula below:
∆T = i * K * mWhere;
i = number of moles of ions produced
K = mola freezing point depression constant
m = molality
From the data given, i (same salt, KBr) and k are both constants.
Hence, the freezing point depression depends on the molality of the solution.
molality = moles / mass of solvent in Kg
Assuming moles = mass (since salt is the same)
Molality of A = 40 / 0.2 = 200 molal
Molality of B = 30 / 0.1 = 300 molal
Molality of A = 20 / 0.25 = 80 molal
Molality of A = 10 / 0.1 = 100 molal
Hence, solution B will have the highest freezing point depression.
Learn more about freezing point depression at: https://brainly.com/question/27184453
#SPJ1
why does bread grow mold more quickly at room temperature than in the refrigerator? why does bread grow mold more quickly at room temperature than in the refrigerator? the formation of mold is an endothermic process, and low temperatures favor endothermic processes. because of the absence of sunlight, the potential energy of the reactants is lower in the refrigerator. more reactants will have the energy necessary to proceed to products at room temperature than at refrigerator temperatures. the formation of mold is an example of a photochemical process, and it cannot occur in a dark place such as a refrigerator.
Bread grows mold more quickly at room temperature than in the refrigerator because more reactants will have the energy necessary to proceed to products at room temperature than at refrigerator temperatures.
Molds are formed on bread due to various reactions that facilitate the living of the molds on the bread and allow them to reproduce on the bread.
However, as molds are living organisms characterized as fungi, they need enzymes for function.
The enzymes and proteins normally function best at room temperature. On the other hand, when the temperatures are low, such as that of a refrigerator the molds will not have enough energy because the proteins and enzymes will be inactivated. Hence, molds grow on bread quickly at room temperature as compared to bread in a refrigerator.
To learn more about mold, click here:
https://brainly.com/question/20303400
#SPJ4
Which of the following compounds has the general formula X3Y2?
Mg2N3 compound having general formula X2Y2 it having cation as +3 charge and bonds ionically with group 15 in a 2:3 ratio.
What is compound?When two or more elements combine chemically in a specific mass ratio, the resulting product is called a compound. Compounds can be defined as substances consisting of two or more different types of elements in a fixed ratio of their atoms.
A compound is one where different types of atoms have joined together to form molecules. For example, water is a compound. The chemical name of water is H2O because it contains two hydrogen atoms and one oxygen atom chemically bonded together.
To learn more about compound ,refer;
https://brainly.com/question/13516179
#SPJ13
the reaction of tert-butyl bromide, (ch3)3cbr, with ethanol affords the substitution product tert-butyl ethyl ether, (ch3)3coch2ch3, in acidic conditions. what would happen to the rate of the reaction if the concentration of ethanol was doubled?
The rate of the reaction if the concentration of ethanol was doubled will remain the same.
The rate of the reaction tert-butyl ethyl ether, (ch3)3coch2ch3, in acidic conditions, will undergo the SN1 mechanism so the rate of reaction will remain the same.
The rate of reaction is the rate at which a chemical reaction takes region, defined as proportional to the increase inside the concentration of a product in step with unit time and to the lower within the awareness of a reactant in line with unit time. response prices can vary dramatically.
The speed with which a reaction takes area is called the fee of a response. as instance, timber combustion has a high response rate since the manner is fast, and rusting of iron has a low response rate as the technique is slow. Rate is most customarily calculated by the usage of the equation The devices of rate calculated in this manner are s -1.
Learn more about the rate of the reaction here:-https://brainly.com/question/24795637
#SPJ4
If an Element has 67 Protons and 68 Neutrons, how many electrons does the element have?
Answer:
67 electrons
Explanation:
Most of the time, the number of protons is the same as the number of electrons because of their relation.
A solution of potassium hydroxide (KOH) is added to a solution of hydrochloric acid. How many moles of potassium hydroxide would react with 1 mole of hydrochloric acid? (Hint: It may help to write out a balanced symbol equation for the reaction.)
Taking into account the reaction stoichiometry, 1 mole of potassium hydroxide would react with 1 mole of hydrochloric acid
Reaction stoichiometryIn first place, the balanced reaction is:
KOH + HCl → KCl + H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KOH: 1 moleHCl: 1 moleKCl: 1 moleH₂O: 1 moleAmount of moles of KOHYou can see that the stoichiometric mole ratio of KOH to that of HCl is 1:1. This means that 1 mole of KOH will require 1 mole of HCl.
Learn more about reaction stoichiometry:
brainly.com/question/27807830
brainly.com/question/15288923
#SPJ1
Please someone answer me
I'm so hurry ........
(Lowest Actual Freezing point and
Vapor pressure = highest effective concentration)
Isn't it ?
Answer:Many of the physical properties of solutions differ significantly from those of the pure substances discussed in earlier chapters, and these differences have important consequences. For example, the limited temperature range of liquid water (0°C–100°C) severely limits its use. Aqueous solutions have both a lower freezing point and a higher boiling point than pure water. Probably one of the most familiar applications of this phenomenon is the addition of ethylene glycol (“antifreeze”) to the water in an automobile radiator.
Explanation:
suppose you performed a titration of a weak acid and you found that the equivalence point occurred at 14.81 ml of added naoh. at what volume would you use the ph to determine the pka of the acid? enter your answer numerically to three significant figures.
The volume at which the pH can be used to determine the pKa of the acid is 7.40 ml if the equivalence point occurred at 14.81 ml of added sodium hydroxide.
The weak acid and the conjugate base will have an equal number of moles at the half-equivalence point as the number of moles of sodium hydroxide will neutralize half of the number of moles of the weak acid which will then produce more conjugate base.
The chemical reaction can be given as;
HA = (H^+) + A^-
Calculation of pKa:
pH = pKa + log[A^-]/[HA]
At half equivalence point, pH = pKa
As, ka = 10^-pka
Therefore, ka = 10^-pH
Volume is given which is 14.81 ml. Therefore, the volume that is used to determine the pKa of the acid can be calculated as follows;
14.81/2 = 7.40 ml
Therefore the volume used to determine the pKa of the acid is calculated to be 7.40 ml
To learn more about equivalence point, click here:
https://brainly.com/question/24584140
#SPJ4
Why was temperature change for the water slight in your experiments while the temperature change for the metal was large?.
The difference in the temperature change can be explained by the difference in the specific heat capacity for water (4.186 J/g°C) and the specific heat capacity for the metal you used (metals have small values for specific heat capacities).
Specific heat capacity is a material characteristic that quantifies how much heat (in Joules) is needed to change the temperature of 1 g of the material by a single degree (°C or K). Water has a relatively high specific heat capacity (4.186 J/g°C), which means that you need to add 4.186 Joules of heat to increase the temperature of 1 g of water by 1 °C.
On the other hand, metals have small values for their specific heat capacities (0.900 J/g°C for aluminum, 0.386 J/g°C for copper, 0.420 J/g°C for steel), which means that their temperature will drastically change for the same amount of heat invested or taken away.
You can learn more about specific heat capacity here:
brainly.com/question/28302909
#SPJ4
you know that the boiling point of a given liquid is dependent on several different variables. what would happen to the boiling point of a liquid if the volume of the liquid was halved?
Because boiling point is independent of liquid volume, the boiling point would not vary.
What is boiling point ?
A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapor pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C.
The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid turns into a vapor is known as the boiling point of a substance
A liquid's boiling point varies depending on the atmospheric pressure in the area. The boiling point of a liquid is lower in a partial vacuum than it is at atmospheric pressure. A liquid's boiling point is lower under low pressure than it is under air pressure. As a result, water boils at 99.97 °C (211.95 °F) at sea level but at 93.4 °C (200.1 °F) at 1,905 m (6,250 ft) altitude under standard pressure. Various liquids will boil at different temperatures at a given pressure.
Because boiling point is independent of liquid volume, the boiling point would not vary.
To know about boiling point from the link
https://brainly.com/question/40140
#SPJ4
during a phase change, even though heat is entering or leaving the system, the overall temperature of the system does not change. a good example of this is the freezing of liquid water to form ice cubes (an exothermic reaction) or the melting of an ice cube to liquid water (an endothermic reaction). if the temperature of the system does not change, what happens to the heat (energy) that is being released from (exothermic) or put into the system (endothermic)?
There is no temperature increase during a phase change because the heat supplied to the substance is used to give the molecules in the substance energy to break free from the forces holding them together.
What is a phase change in a substance?A phase change in a substance refers to the process by which a substance changes from one physical state to another when heat is added or removed from it.
A phase change is also called a change of state.
The various types of phase changes are as follows;
melting - this is the process whereby a substance changes from solid to liquidvaporization - this is the process whereby a substance changes from liquid to gassolidification - this is the process whereby a substance changes from liquid to solidcondensation - this is the process whereby a substance changes from gas to liquidDuring a phase change, even though heat is entering or leaving the system, the overall temperature of the system does not change. This is because the heat energy supplied is used to overcome the forces between the molecules of the substance.
Learn more about phase change at: https://brainly.com/question/13067020
#SPJ1
how do atoms form a new substance? responses by sharing electrons with each other by sharing electrons with each other by losing electrons by losing electrons by gaining electrons from each other by gaining electrons from each other by losing neutrons to each other
By exchanging electrons with one another, atoms create new materials. When two atoms share at least one pair of electrons, this is known as a covalent link. Ionic bonds form when positive are attracted to one another and share an electron as a consequence.
What does joining atoms to create new compounds and sharing electrons have in common?When two atoms share , they establish a connection. Because the two positively charged atomic nuclei and shared, negatively charged electrons in a covalent bond are attracted to one another by electrostatic forces, the bond is stable.
One or more pairs of electrons from each atom are shared by the other atoms to form a covalent link. The two atomic nuclei are pulling these electrons in opposite directions. When the gap between two atoms' electronegativities is too narrow for an electron transfer to take place and form ions, a covalent bond is created.
Reactants interact with one another in a chemical reaction, breaking the bonds that hold their atoms together.
Learn more about covalent bond refer
https://brainly.com/question/3447218
#SPJ14
Answer:
Here's your answer on the Image!
Explanation:
I took the K-12 Quiz
the distribution coefficient between methylene chloride and water for solute y is 11. an amount of 50.0 g of y is dissolved in 250 ml of water. a) what weight of y would be removed from water with a single extraction with 250-ml of methylene chloride? show calculations and report to 1 decimal place. copyright 2021. govindarajoo, g. rutgers, the state university of new jersey. all rights reserved. b) what weight of y would be removed from water (the original solution) with two successive extractions with 125-ml portions each of methylene chloride? show calculations and report to 1 decimal place.
Using the distribution coefficient, we can calculate the masses removed from water: a) 45.8 g; b) 48.8 g.
If the distribution coefficient between DCM (methylene chloride) and water is 11, that means that the concentration in DCM is 11 times greater than the concentration in water.
a) When equal volumes of the solvents are used, the amount of the solute in DCM (A) will be 11 times greater than the amount of solute remaining in water (B).
A + B = 50.0 g
A = 11 B
11 B + B = 50.0 g
12 B = 50.0 g
B = 50.0 g / 12
B = 4.17 g
A = 11 * 4.2 g
A = 45.8 g
b) Because the solvent volumes are not the same, we have to use concentrations. We can still label the mass of Y in DCM as A, and the mass of Y in water as B. After a single extraction with 125 mL of DCM we get:
A₁ + B₁ = 50.0 g
(A₁ / 125 mL) / (B₁ / 250 mL) = 11
2 A₁ / B₁ = 11
A₁ = 11 B₁ / 2
A₁ = 5.5 B₁
5.5 B₁ + B₁ = 50.0 g
6.5 B₁ = 50.0 g
B₁ = 50.0 g / 6.5
B₁ = 7.7 g
So, after the first extraction, 7.7 g of Y has remained in water. That means that for the second extraction:
A₂ + B₂ = 7.7 g
A₂= 5.5 B₂
5.5 B₂ + B₂ = 7.7 g
6.5 B₂ = 7.7 g
B₁ = 7.7 g / 6.5
B₁ = 1.2 g
After the second extraction, only 1.2 g of Y has remained in water, while 50.0 g - 1.2 g = 48.8 g of Y was removed from water.
You can learn more about the distribution coefficient here:
brainly.com/question/5596294
#SPJ4
aldol condensation is an easy way of making: group of answer choices carbon-carbon bond carbon-oxygen bond carbon-nitrogen bond carbon-hydrogen bond all of these bond types
Aldol condensation is an easy way of making carbon-carbon bond.
In the field of chemistry, we can describe aldol condensation as a type of bond that occurs due to electrophilic substitution at the alpha carbons of the enol.
Aldol condensation is known to be the easiest way for one carbon to form bonds with another carbon.
Such an aldol reaction that takes place between carbonyl compunds instead of aldehydes or enols is referred to as crossed aldol condensation.
Aldol reactions are known to be an important part of synthesizing organic compounds as carbon-carbon bonds are formed due to it.
To learn more about aldol condensation, click here:
https://brainly.com/question/14260386
#SPJ4
A large bar of solid gold is melted into liquid. the liquid is then poured into molds to make a number of gold coins. was this chemical or physical? explain.
Answer:
physical change
Explanation:
melting is a physical change, a physical change does not involve a change in chemical bonds.
the bromide ion concentration in a solution may be determined by the precipitation of lead bromide. pb2 (aq) 2br-(aq) pbbr2(s) a student finds that 19.43 ml of 0.5740 m lead nitrate is needed to precipitate all of the bromide ion in a 10.00-ml sample of an unknown. what is the molarity of the bromide ion in the student's unknown?
The molarity of the bromide ion is 0.882 M .
Molar concentration is a measure of the attention of a chemical species, specially of a solute in an answer, in phrases of amount of substance in keeping with unit quantity of solution.
In chemistry, the maximum typically used unit for molarity is the number of moles consistent with liter, Molarity refers to the attention of a compound or ion in a solution, and normality refers back to the molar attention handiest of the acid aspect or handiest of the base component of the solution. therefore, normality gives know-how of the solution's concentration in acid-base reactions.
Pb⁺² + 2Br⁻ => PbBr₂
19.38 ml × 0.5690 M = 11.03 millimoles of Pb⁺²
millimoles of Br⁻ = 2 × millimoles of Pb⁺²
= 2 × 11.03
= 22.06 millimoles of Br⁻
= 22.06 millimoles/25 ml
molarity = 0.882 M in Br⁻.
Learn more about molarity here:-https://brainly.com/question/26873446
#SPJ4
a sample of 4.50g of methane occupies 12.7dm3 at 310k. (i) calculate the work done when the gas expands isothermally against a constant external pressure of 200torr until its volume has increased by 3.3dm3 . (ii) calculate the work that would be done if the same expansion occurred reversibly
(a) The work done when the gas expands isothermally against a constant external pressure is 87.992 kJ
(b) The work that would be done if the same expansion occurred reversibly is 167.4 J
Given that the mass of methane m is = 4.5 gram = 0.0045 kg
Volume occupies [tex]V_{1}[/tex] = [tex]12.7dm^{3}[/tex]
And volume is increased by [tex]3.3dm^{3}[/tex]
So, the increased volume [tex]V_{2}[/tex] is
12.7 + 3.3 = 16 litres
Given temperature T is 310K
Pressure is given as 210 Torr = 26664.5 Pa
(a) Now, at the given pressure the work done is given by
W = P( [tex]V_{2}[/tex] - [tex]V_{1}[/tex])
W = 26664.5 (16 - 12.7)
W = 87992.85 J
W = 87.992 kJ
(b) At reversible process work done is given by
W = nRT㏑[tex]\frac{V2}{V1}[/tex]
We have the given mass = 4.5 gram
Molar mass of methane = 16
So number of moles is
n = Mass in gram / Molar Mass
n = 4.5 / 16
n = 0.28125
So, work done is
W = 0.28125 × 8.314 × nRT㏑[tex]\frac{16}{12.7}[/tex]
W = 167.4 J
Know more about Reverse expansion: -https://brainly.com/question/17997117
#SPJ4
Which animal will a photographer take a picture of in North American grassland
O a gazelle
O a lion
O a buffalo
O an ostrich
Answer:
a buffalo
Explanation: if its north America it needs to be native from here none of the other are from north America
Suppose 57.9 mL of a 0.196 M solution of Na2SO4 reacts with 167 mL of a 0.398 M solution of MgCl2 to produce MgSO4 and NaCl as shown in the balanced reaction.
Na2SO4(aq)+MgCl2(aq)⟶MgSO4(s)+2NaCl(aq)
Calculate the mass of MgSO4 that can be produced in the given reaction.
Only 0.453 g of MgSO4 are isolated after carrying out the reaction. Calculate the percent yield of MgSO4.
The mass of the object obtained is 1.32 g and the percent yield is 34.3%.
What is the amount produced?We know that the reaction equation shows the way the reactants are able to interact so as to obtain the products. We have that;
Number of moles of sodium sulfate = 0.196 M * 57.9/1000 L
= 0.011 moles
Number of moles of magnesium chloride = 0.398 M * 167/1000 L
= 0.066 moles
Given that the reaction is 1:1, the limiting reactant is sodium sulfate
Then;
Mass of the magnesium sulfate produced = 0.011 moles * 120 g/mol
= 1.32 g
The percent yield of the magnesium sulfate = 0.453 g/ 1.32 g * 100/1
= 34.3%
Learn more about percent yield:https://brainly.com/question/17042787
#SPJ1
Al + Pb(NO3)2 -------------------------------> ? fasttttttttttttttttt
4Al + 2Pb(No3)2 → 4Al(No3) + Pb2
Hope this helps!
i have 23.45g of AlBr3, and 34.57g of na2o, which of these substances is the limiting reagent
Answer
AlBr₃ is the limiting reactant
Explanation
Mass of AlBr₃ = 23.45 g
Mole of AlBr₃ = Mass/molar mass = 23.46 g/266.69 g/mol = 0.08797 mol
Mass of Na₂O = 34.57 g
So mole of Na₂O = mass/molar mass = 34.57 g/61.9789 g/mol = 0.5578 mol
Mole ratio of AlBr₃ to Na₂O = (0.08797/0.08797) : (0.05578/0.08797) = 1:6
To know the limiting reactant, write a chemical equation for the reaction and compare the reactant mole ratio in the equation with the mole ratio above.
2AlBr₃ + 3 Na₂O -----> Al₂O₃ + 6NaBr
Mole ratio in the equation = 2:3
Comparing the mole ratio, AlBr₃ will be the first to be completely consumed.
Therefore, AlBr₃ is the limiting reactant
Which weather pattern consists of a low-pressure system of rising warm, moist weather that leads to cloudy and rainy weather?
Cyclone movement
Convection currents
The Coriolis effect
Anticyclone winds
pls help soon
Answer:
Cyclone Movement
Explanation:
To form a cyclone, warm, moist air over the ocean rises upward from near the surface. As this air moves up and away from the ocean surface, it leaves is less air near the surface.
So basically as the warm air rises, it causes an area of lower air pressure below.
water molecules slide around each other, making and breaking hydrogen bonds. as energy is added, the molecules move so rapidly that they fly off in all directions. this phase-change process is
Water molecules slide around each other, results in making and breaking of hydrogen bonds. As energy is added, molecules move rapidly that they spread in all directions. This phase-change process is called vaporization.
The temperature of liquid water increases as it is heated up until it reaches 100°C. Water that was in liquid state turns into vapors at this point. This transition of a liquid into a gas is referred to as Vaporization. The water molecules absorb heat energy. As a result, the particles move more quickly as they gain extra energy until they possess sufficient energy to break free of the liquid molecules to vapors. There are two types of vaporization. 1. Boiling that occurs below the surface of a liquid. The boiling point of a liquid is the temperature at which it begins to boil. Water has a boiling point of 100 °C. 2. Evaporation that take place at the surface of the liquid. Some of the molecules that move faster are able to overcome the forces of attraction of other molecules and escape from the water's surface.
To learn more about Hydrogen Bonds click here
brainly.com/question/15099999
#SPJ4