The empirical formula of the compound is CH₂O, and the molecular formula of the compound is C₂H₄O₂.
All of the carbon in the compound is converted into carbon dioxide (14.35 g) and all the hydrogen in the compound is converted to water (5.876 g). This means that we can use these masses to find the masses of carbon, hydrogen, and oxygen in the original compound.
First, we calculate the mass of carbon in carbon dioxide and the mass of hydrogen in water, using their respective molar masses (M(CO₂) = 44 g/mol; M(H₂O) = 18 g/mol):
12 g of carbon : 44 g of carbon dioxide = X : 14.35 g of carbon dioxide
X = 12 g of carbon * 14.35 g of carbon dioxide / 44 g of carbon dioxide
X = 3.914 g of carbon
2 g of hydrogen : 18 g of water = X : 5.876 g of water
X = 2 g of hydrogen : 5.876 g of water / 18 g of water
X = 0.6529 g of hydrogen
Because the compound contains carbon, hydrogen and oxygen, we can now calculate the mass of oxygen in the compound:
m(O) = m(sample) - m(C) - m(H)
m(O) = 9.791 g - 3.914 g - 0.6529 g
m(O) = 5.224 g
Now we use these masses to calculate the number of moles (n) for each of the elements, using their respective molar masses (M(C) = 12 g/mol, M(H) = 1 g/mol, M(O) = 16 g/mol):
n = m/M
n(C) = m(C) / M(C)
n(C) = 3.914 g / 12 g/mol
n(C) = 0.3284 mol
n(H) = m(H) / M(H)
n(H) = 0.6529 g / 1 g/mol
n(H) = 0.6529 mol
n(O) = m(O) / M(O)
n(O) = 5.224 g / 16 g/mol
n(O) = 0.3265 mol
We divide each of these amounts by the smallest of them (0.3265 mol) to obtain the molar ratio of the elements:
carbon: 0.3284 mol / 0.3265 mol = 1.006
hydrogen: 0.6529 mol / 0.3265 mol = 2.000
oxygen: 0.3265 mol / 0.3265 mol = 1.000
These integers are indexes in the empirical formula of the compound - CH₂O
The molar mass of this empirical formula is:
12 g/mol + 2 * 1 g/mol + 16 g/mol = 30 g/mol
We divide the molar mass of the compound by the molar mass of the empirical formula:
60.05 g/mol / 30 g/mol = 2.002
So, we multiply the indexes by 2 to obtain the molecular formula - C₂H₄O₂
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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
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.
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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 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.
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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
helium condenses to a liquid at 4.224 k under atmo- spheric pressure and remains a liquid down to the abso- lute zero of temperature. (it is used as a coolant to reach very low temperatures.) the vapor pressure of liquid helium at 2.20 k is 0.05256 atm. calculate the volume occupied by 1.000 mol helium vapor under these condi- tions and compare it with the volume of the same amount of helium at standard temperature and pressure.
If we assume that helium acts as an ideal gas, we can calculate that 1.000 mol of it will take up 3.43 L, which is 6.53 times less than its volume at standard conditions.
Assuming that helium behaves like an ideal gas in both cases, we can calculate the volume at 2.20 K using the ideal gas equation:
PV = nRT
P - the pressure exerted by the gas (0.05256 atm)
V - the volume of the gas
n - number of moles of the gas (1.000 mol)
R - universal gas constant (0.08206 L*atm/K*mol)
T - temperature (2.20 K)
If we rearrange the equation, we get:
V = nRT/P
Now we plug in the known values:
V = 1.000 mol * 0.08206 L*atm/K*mol * 2.20 K / 0.05256 atm
V = 3.43 L
At standard conditions (273 K, 1 atm), 1 mol of an ideal gas has a volume of 22.4 L, so the volume at described conditions is 22.4 L / 3.43 L = 6.53 times smaller than at standard conditions.
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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.
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.
element x has two naturally occurring isotopes. if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu, what is the atomic mass of element x?
The atomic mass of element x is 85.56 amu if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu
The atomic mass of an element can be determined by first multiplying the percentage of its isotopes by their atomic mass and then adding the resultants together.
As 72% of the atoms have a mass of 85 amu and 28% have a mass of 87 amu, therefore
atomic mass of element x = (72% × 85) + (28% × 87)
atomic mass of element x = (72/100 × 85) + (28/100 × 87)
atomic mass of element x = (0.72 × 85) + (0.28 × 87)
atomic mass of element x = 61.2 + 24.36
atomic mass of element x = 85.56 amu
Therefore the atomic mass of element x is calculated to be 85.56 amu.
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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.
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[cu2 ] concentration in a copper-silver electrochemical cell is 0.1m at 25 oc. if the total cell potential is 0.422v, what is the [ag ] concentration?
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
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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.
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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.
Al + Pb(NO3)2 -------------------------------> ? fasttttttttttttttttt
4Al + 2Pb(No3)2 → 4Al(No3) + Pb2
Hope this helps!
you cool a liquid mixture of acetic acid and water that has a mole fraction of water of 0.9. as you begin to freeze the acetic acid/water mixture, what happens to the mole fraction of water in the liquid phase?
The mole fraction of water decreases because, at this starting mole fraction, solid water forms before solid acetic acid.
What is mole fraction ?
Mole fraction represents the number of molecules of a particular component in a mixture divided by the total number of moles in the given mixture. It’s a way of expressing the concentration of a solution.
The amount fraction is another name for the mole fraction. It is the same as number fraction, which is calculated by dividing the number of molecules in a constituent (Ni) by the sum of all molecules. Instead of using a Roman x, the lowercase Greek letter chi is occasionally used to represent the mole fraction. The IUPAC recommends the letter y for gas mixtures.
Because it does not include the name of the unit mole, the National Institute of Standards and Technology of the United States prefers the phrase amount-of-substance fraction to mole fraction.
Molar concentration is a proportion of moles to volume, whereas mole fraction is a ratio of moles to moles.
The mole fraction of water decreases because, at this starting mole fraction, solid water forms before solid acetic acid.
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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.
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.
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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
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Can I find a tutor help me wit this question?
Chemistry =>Introduction to Chemistry => Scientific Method
A scientific method corresponds to a methodology to obtain new knowledge.
We must start from an idea, an assumption of how a compound or a process behaves, this is our hypothesis.
Following this, we must identify what can affect our process, what are the variables, and what will be the response variable, for this we carry out an experiment.
Once the experiments have been carried out, we must analyze the results, draw conclusions as to why the behavior occurs, and if our hypothesis is true or not.
It is useless for us to obtain new knowledge if we do not share it, We have to share the results, in this way other people can start from that knowledge to create another,
Therefore, the answer will be:
1. Make a hypothesis
2. Conduct an experiment
3. Analyze the experiment data
4. Communicate the results
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⁻.
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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.
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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.
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A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano how are birds in the area going to be impacted
A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.
What is volcano?Volcano is defined as a rupture in the part of the crust of the planetary mass of the object generally Earth, which allows the hot lava as well as ash, including the gases that has been escaped from the chamber of the magma.
Therefore, A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.
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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.
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In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?
O A. Combustion and expansion
O B. Compression and ignition
O C. Exhaust
O D. Air and fuel intake
Answer:
Explanation:
In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?
O C. Exhaust
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:
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.
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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.
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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.
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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%
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