AnswersCISD-Chemistry B-CRUnit Test

Gas Laws Answers

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Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO?

A
the mass
B
the volume
C
the number of molecules
D
the number of oxygen atoms
2
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What is the molar mass of fluorine, F2?

A
9.00 g/mol
B
18.00 g/mol
C
19.00 g/mol
D
38.00 g/mol
3

The equation below shows lithium reacting with nitrogen to produce lithium nitride.6Li + N2 2Li3NIf 12 mol of lithium were reacted with excess nitrogen gas, how many moles of lithium nitride would be produced?

Question illustration
A
4.0 mol
B
6.0 mol
C
12 mol
D
36 mol
4

The equation shows the reaction between zinc metal and hydrochloric acid.Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g)What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?

Question illustration
A
5.05 g
B
10.1 g
C
182 g
D
682 g
5

Consider the chemical equation. 2NBr3 + 3NaOH N2 + 3NaBr + 3HOBrIf there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant?

Question illustration
A
N2
B
NBr3
C
NaOH
D
HOBr
6

The balanced equation below shows the products that are formed when pentane (C5H12) is combusted. C5H12 + 8O2 5CO2 + 6H2OWhat is the mole ratio of oxygen to pentane?

Question illustration
A
1:6
B
6:8
C
8:1
D
5:8
7

Which statement correctly describes the actual yield and the theoretical yield of a reaction?

A
The actual yield is calculated from the reactant amounts, but the theoretical yield must be measured for each instance of a reaction.
B
The actual yield is calculated from the amount of the limiting reactant, and the theoretical yield is calculated from the amount of the excess reactant.
C
The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts.
D
The actual yield represents the maximum yield possible, and the theoretical yield assumes perfect reaction conditions.
8

Avogadro’s number was calculated by determining the number of atoms in

A
12.00 g of carbon-12.
B
14.00 g of carbon-12.
C
12.00 g of oxygen.
D
14.00 g of oxygen.
9

The following balanced equation shows the formation of ammonia.N2 + 3H2 2NH3How many moles of nitrogen are needed to completely convert 6.34 mol of hydrogen?

Question illustration
A
1.02 mol
B
2.11 mol
C
12.68 mol
D
19.02 mol
10

Consider the balanced equation below. 2H2S + 3O2 2SO2 + 2H2OWhich option gives the correct mole ratios?

Question illustration
A
H2S:SO2 = 2:2 and O2:H2O = 3:2
B
H2S:SO2 = 2:3 and O2:H2O = 3:2
C
H2S:SO2 = 4:4 and O2:H2O = 5:4
D
H2S:SO2 = 4:6 and O2:H2O = 4:4
11

Which statement best describes a mole?

A
It is used mainly for writing chemical formulas.
B
It is used for chemical equations that have reversible reactions.
C
It is used for directly comparing the amounts of substances.
D
It is used mainly for dealing with fluid substances.
12

Consider the chemical equation.2H2 + O2 2H2OWhat is the percent yield of H2O if 87.0 g of H2O is produced by combining 95.0 g of O2 and 11.0 g of H2?Use .

Question illustration
A
56.5%
B
59.0%
C
88.5%
D
99.7%
13

Acid rain can be destructive to both the natural environment and human-made structures. The equation below shows a reaction that occurs that may lead to the formation of acid rain. 3NO2 + H2O 2HNO3 + NOHow many moles (precise to the nearest 0.01 mol) of nitric acid are produced from 300.00 mol of nitrogen dioxide?

Question illustration
A
200.00 mol
B
200.09 mol
C
450.00 mol
D
450.02 mol
14

Consider the balanced equation.CuSO4 + Zn ZnSO4 + CuIf 200.0 g of copper(II) sulfate react with an excess of zinc metal, what is the theoretical yield of copper?

Question illustration
A
1.253 g
B
50.72 g
C
79.63 g
D
194.3 g
15

Consider the equation below.Na+ + Cl– NaClWhich statement best describes the relationship between the substances in the equation?

Question illustration
A
The number of sodium ions is equal to the number of formula units of salt.
B
The number of sodium ions is less than the number of chloride ions.
C
The number of chloride ions is less than the number of formula units of salt.
D
The number of sodium ions is two times the number of formula units of salt.
16

The formula is used to calculate the

Question illustration
A
real
B
percent
C
molar
D
empirical
17

The reaction below shows how silver chloride can be synthesized.AgNO3 + NaCl NaNO3 + AgClHow many moles of silver chloride are produced from 15.0 mol of silver nitrate?

Question illustration
A
1.0 mol
B
15.0 mol
C
30.0 mol
D
45.0 mol
18

Which is the molar mass of BF3?

A
10.81 g/mol
B
29.81 g/mol
C
48.81 g/mol
D
67.81 g/mol
19

The mole concept will most likely be used in

A
calculating the average height of a mountain range.
B
measuring how many liters of gasoline are poured into a tank.
C
determining how many ozone molecules are lost in the atmosphere.
D
finding the mass of a piece of steak in a butcher shop.
20

A 13.00 g sample of citric acid (H3C6H5O7) reacts with an excess of baking soda as shown in the equation.What is the theoretical yield of carbon dioxide?

Question illustration
A
0.993 g
B
2.98 g
C
3.65 g
D
8.93 g

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