Hess law can help us to obtain the enthalpy of a series of reactions by summation. The missing enthalpy of this reaction is −198kJ.
What is Hess law?According to the Hess law of constant heat summation, the enthalpy of a sequence of reactions can be obtained as the sum of the enthalpies of all the reactions.
Now looking at all the reavtion written here in order to obtain the missing enthalpy, we conclude that the missing enthalpy is −198kJ.
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2SO2 (g) + O2 (g)→2SO3 (g), ΔH = −198 kJ.
What’s the answer?????? I accidentally clicked the 1st one.
Answer:
its the 1st one at the top
Na
Η Ο
Is this an element or a compound?
Answer:
compound
Explanation:
because h is hydrogen, then O is oxygen
How many grams of CO2 are produced from the burning of 3.0 mol of amyl alcohol?
2C5H11OH + 15O2➡️ 10CO2 + 12H2O
*Please show work
The amount, in grams, of [tex]CO_2[/tex] that would be produced from the burning of 3.0 mol amyl alcohol would be 660.15 grams
Stoichiometric calculationFrom the equation of the reaction:
[tex]2C_5H_1_1OH + 15O2 ---- > 10CO_2 + 12H_2O[/tex]
The mole ratio of amyl alcohol to the [tex]CO_2[/tex] produced is 2:10.
Thus, for 3.0 mol of amyl alcohol, 15 mol of [tex]CO_2[/tex] would be produced.
Mass of 15 mol [tex]CO_2[/tex] = 15 x 44.01 = 660.15 grams
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Question 1 (2 points)
Calculate the following and provide the answer rounded off to the correct accuracy.
2.150 x 102 cm + 7.34 x 102 cm - 3.2 x 102 cm
X
Answer Instructions:
– For a decimal, use (.) and not (.).
As
Note: Your answer is assumed to be reduced to the highest power possible.
The solution to the polynomial expression since the power of the variable is in the second degree is 6.29 × 10² cm
What is the power of a variable?The power of a variable refers to the exponent of the variable and the highest power of a variable is the degree to which the variable is being raised. From the information given, the highest power of the variable is a polynomial.
Given that:
[tex]\mathbf{= 2.150 \times 10^2 \ cm + 7.34 \times 10^2 \ cm - 3.2 \times 10^2 \ cm }[/tex]
So, since the exponents are in the same power we are going to add them all together multiplied by their exponent.
i.e.
[tex]\mathbf{= (2.150 + 7.34 - 3.2) \times 10^2\ cm }[/tex]
[tex]\mathbf{= 6.29 \times 10^2\ cm }[/tex]
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2.1 Interpret the results based on your understanding. Indicate deficiencies and excesses. (20)
2.2 How will you correct the deficiencies and/or excesses found in this soil?
Soil nutrients are minerals which are required for growth either small or relatively large quantities
What are soil minerals?Soil minerals are the metallic and non-metallic nutrients found in the soil which are required by plants for growth.
Based on plants requirements, the major nutrients are nitrogen, phosphorus and potassium.
Plants also require other nutrients like copper, zinc, sulfur, iron, etc., in smaller quantities.
Based on the results of the soil test:
The deficiencies nutrients are copper and potassium The excess nutrients are phosphorus, sulfur, iron and zincThe deficiencies and excesses can be corrected by selectively reducing the application of the excess soil nutrients and addition of the deficient nutrients.
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Which of the following is NOT an example of potential energy?
A. Gravitational pull C. Chemical Bonds
B. Nuclear energy D. Electricity
Answer:
Answer C
Explanation:
Chemical Bonds
345.50 grams of C6 H12 O6 = how many mol C6H12O6 ? - (MM=180.16g/mol).
100.0grams of O2 = how many mol O2? - (MM=32.00g/mol).
14.37 moles of AgNO3 = how many grams AgNO3? - (MM= 169.87g/mol).
Answer:
0.56 M
Explanation:
We are given;
Mass of glucose solute is 50.50 g
Volume of solution is 500 mL
We are required to calculate the concentration of glucose.
We need to know that, molarity is the concentration of a solution in moles per liter.
Molarity = Number of moles ÷ Molar mass
Which of the following is an example of the organic portion of the Earth’s outer layers?
Oxides
Coal
Sulfides
Carbonates
Answer:
Coal
Explanation:
Coal is derived from ancient plant life and thus consists largely of organic compounds.
The example of the organic portion of the Earth’s outer layers is coal.
What are the layers of earth?The earth is made up of many layer which are very important for human life and our planet earth.
The earth is basically made up of three different layers.
Crust - Crust is defined as a rocky planet's, dwarf planet's, or natural satellite's outermost solid shell.Mantle - Mantle is defined as the layer between the Earth's crust and the molten iron core, a thick layer of hot, solid rock.Core - The core are made up of two layer the outer core and the inner is the mantle.There are basically five layers of earth atmosphere.
TroposphereStratosphereMesosphereThermosphereExosphereThus, the example of the organic portion of the Earth’s outer layers is coal.
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This is my question
Answer:
[tex] \\ [/tex]
refer the three attached images for the respective answers.
hope helpful ~
MATH AND SCIENCE
Out of around 260,000 known species of angiosperms, approximately 195,000 are dicots. what percentage of angio sperms are dicots
Answer:
Explanation:
Formula
% = (dicots/angiosperms) * 100
Givens
angiosperms (total) = 260000
Dicots = 195000
Solution
% = (195000/260000) * 100
% = 0.75 * 100
Answer: % = 75% are dicots
What is the molarity of a solution formed from 0.625 moles of NaCl with a total volume of 250 mL
Answer:
2.5 M
Explanation:
.625 M / .250 Liter = 2.5 M
9. Compound A, with molecular formula C5H₁2 has only 1° and 4° carbons. What is its structure? Its other isomer has only 1°, 2° and 3° carbons. What is its structure also?
draw the structure
Answer:
Ok giv me a min
Explanation:
10) What volume of oxygen at STP must react with 5.8 L of hydrogen to form water?
(Hint: write and balance the reaction first)
The answer is 2.9L (I NEED THE STEPS)
2.9 L of oxygen are required to react with 5.8 L of hydrogen at STP to form water.
What is the balanced equation of the formation of water?Hydrogen gas and oxygen gas combines in a molar volume ratio of 2 : 1 to form water.
The equation of the reaction is given as follows:
2 H2O + O2 ----> 2 H2OThus, twice the volume of hydrogen is required with a given volume of oxygen to form water.
If 5.8 L of hydrogen is available for reaction at STP, the volume of oxygen required all be half of 5.8 L.
Volume of oxygen required = 5.8 / 2 = 2.9 L
Therefore, 2.9 L of oxygen are required to react with 5.8 L of hydrogen at STP to form water.
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Hi
Can someone explain the second marking point?
Why is it bubbles of air and not C02?
If I add 30mL of water to 125mL of a 0.15M of NaOH solution, what will the molarity of the dilated solution be?
Answer:
.12 M
Explanation:
.15 M / L * .125 L = .01875 Moles
now add 30 ml for total 155 ml = .155 L
.01875 M / .155 L = .12 M
How does the number of lone pairs affect the bonding pairs?
A. They repel more strongly than the bonding pairs, pushing the bonding pairs closer together.
B. They occur between the bonding pairs, pushing them to opposite sides of the central atom.
C. It does not affect them.
D. The pull the bonding pairs, widening the angle between them.
Answer:
A. They repel more strongly than the bonding pairs, pushing the bonding pairs closer together.
Explanation:
Lone pairs are in simple terms just pairs of electrons on the atom. Negative does not attract negative so it repels from the bonds. I put it in the most simple terms possible. Like with magnets north and north don't attract. Same concept
Can I get answer to both of those questions
As a solution becomes more basic:
Your car breaks down. As your friends help
you puch it, it begins to move and speed
up.
try stopping putting the car in park before fixing
HELPPPPP
54.5 g of Ca(NO3)2 was used to create a 1.5 M solution. What is the volume of the solution in ml?
We have already been introduced to solutions. Several chapters ago molarity (M) was introduced. Molarity is measured in moles per liter, or mol/L. A 0.30 M NaCl solution means that there is 0.30 mol NaCl in every liter of solution.
Often chemists have to make solutions; so, doing the calculations necessary to make a certain amount of solution become second nature.
For example:
Make 250 mL of a 0.30 M NaCl solution.
To make the solution we need to calculate the amount of NaCl to dissolve to make 250 mL of solution.
start with 250 mL
The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up to the line on the volumetric flask.
But molarity is not the only unit we use; so, we need to be able to convert between different units...
Common units of concentration include
<==> <==><==>
% wt.
% vol
molarity (M)
molality (m)
mol fraction
That is, the mol fraction of "a" is the number of moles of "a" present divided by the total number of moles of material in the solution (including the solvent).
There is no simple formula for converting from one concentration unit to the next. In general the first step is to pick a convenient sample size. Then work to change each part of the concentration unit to the new unit. Do not try to do the conversion all at once.
For example,
HCl comes in bottles marked 37 % HCl by weight. The density of the solution is 1.200 g/cm-1. What is the molarity of the solution?
A conveneint sample size is 100 g of solution; convenient because 100 g x 37% = 37 g HCl.
This is the key...you must know the definitions for all the concentration terms
First, convert number of grams of HCl in your sample to number of moles in your sample (the 100 g of solution).
Second, convert g of solution to L of solution.
Third, divide moles by liters and you have molarity.
What is the molality of this solution?
Going from M to m. Since the concentration is in M a convenient sample size is 1 L.
OK, so the first conversion is not a conversion...there are 12 mol HCl present in 1 L of solution.
The second conversion is not as easy as it first appears. Let's use the density of the solution to perform a conversion from volume to mass.
This is NOT the mass that is used in molality. We just determined the mass of the solution; molality uses the mass of the SOLVENT!
The solution is made of a solvent and a solute. So, the mass of solvent can be found by subtracting the mass of the solute from the mass of the solution.
The two main types of weathering are
a
mechanical and physical
b
physical and kinetic
c
chemical and physical
d
chemical and acidic
Answer:
c. chemical and physical
Which statement best predicts and explains the product of a single displacement reaction when the cation (A) with an oxidation number of +2 and an anion (B) with the oxidation number of -3 react and form a compound?
A+2B-3 is the predicted formula when each metal cation has a charge of +2 and each non metal has a charge of -3.
B2A3 is the final formula for the metal anion bonding to the non-metal cation in a 2:3 ratio.
A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
A3B2 is the predicted formula is made when each metal cation gains three electrons from the anion while each nonmetal loses 2 electrons to each of the cations.
The statement that best predicts and explains the product of a single displacement reaction is ; ( C ) A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
Octet stateGiven that the oxidation number is +2 shows that it will be an octet when it donates its 2 electrons. also for octet B it will become complete when it accepts 3 electrons. Therefore in order to balance out the octet of each atom is by cross multiplying to get A3B2.
Hence we can conclude that The statement that best predicts and explains the product of a single displacement reaction is ; A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
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Metallic bonds are formed from the sharing of valence electrons.
O A. True
OB. False
SUBMIT
Answer:
A. True
Explanation:
A metallic bond is a type of chemical bond formed between positively charged atoms in which the free electrons are shared among a lattice of cations. In contrast, covalent and ionic bonds form between two discrete atoms. Metallic bonding is the main type of chemical bond that forms between metal atoms.
Its chemical formula is C17H19NO3. What percent, by mass, is carbon in this compound?
Explain the four basic types of chemical reactions. Be sure to include a sample equation for each type.
Acid Base reaction (Neutralization reaction)
it is the reaction between acid and base which neutralize each other to give salt and water.
example: Hydrochloric acid + Sodium hydroxide --------> sodium chloride + water
HCl + NaOH--------> NaCl + H2O
Quantity of atoms in .3521 mol in ZrSiO4
Answer:
look the image
Explanation:
What is the numbers of molecules for 65.8g of CO2?
Answer:
8.98*10^23 molecules CO2
Explanation:
The molar mass of CO2 is 44.0 grams/mol. If we convert 65.8 grams of CO2 into moles, 65.8g CO2 / 44.0g CO2 then we get about 1.49 moles of CO2. We know there are 6.02*10^23 molecules in a mole, so we would just multiply 1.49 mol CO2 * 6.02*10^23 = 8.98*10^23
Which of the following potential ligands can form a maximum of two bonds to a metal
ion?
(a) C2042
(b) EDTA
(C) porphine
(d) CO32-
(e) both (a) and (d)
Based on the potential ligands given, C2O42- and CO32- can form a maximum of two bonds to a metal
ion.
What are ligands?Ligands are ion or molecule that binds to a central metal atom to form a coordination complex.
Ligands are essential in many biological and enzyme complexes.
From the potential ligands given;
C2O42- can form can form a maximum of two bonds to a metal ionCO32- can form two a maximum of two bonds to a metal ionEDTA can form five to six bonds to a metal ionPorphine can form one bond to a metal ionTherefore, the potential ligands, C2O42- and CO32- can form a maximum of two bonds to a metal
ion.
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Which 2 elements has reactivity that is similar to chlorine?
if you observe a first quarter on January 3 on what date will you see a full moon?
if you observe a first quarter on January 3, the date will you see a full moon is on February 1st.
What is the full moon about?The lunar phase during which the Moon is completely illuminated from Earth's perspective is known as the full moon. When Earth is situated halfway between the Sun and the Moon, this happens. This indicates that the near side of the moon, which faces Earth, is fully illuminated by the sun and appears as a roughly circular disk.
The Moon is a symbol for both the emotional and physical bodies. The full Moon is a time to be open and receive the spirit's light and awareness into your physical, emotional, and mental bodies
It takes 29 day, to get to the full moon. This will be:
= January 3 + 29 days
= February 1st
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