### Stoichiometry Review Questions

```Stoichiometry Review
Stoichiometry Review
Subject:
Date:
1
How many moles are in 22.0 g of carbon dioxide?
A
B
C
D
E
What is the mass of one atom of copper in grams?
A
B
C
D
E
4
63.5 g
52.0 g
58.0 g
65.4 g
1.06 x 10­22 g
How many atoms of hydrogen are present in 6.0 g of water?
A
B
C
D
E
5
0.50 mol
2.0 mol
0.5 mol
2.00 mol
0.500 mol
Naturally occurring element X exists in three isotopic forms: X­28 (27.977 amu @ 92.21 % abundance), X­29 (28.976 amu @ 4.70% abundance), and X­30 (29.974 amu @ 3.09% abundance). Calculate the atomic weight of X.
2
3
AP Chemistry
«date»
2.0 x 1023
7.2 x 1024
1.1 x 1024
4.0 x 1023
0.66
Nitric acid contains what percent hydrogen by mass?
A
B
C
D
E
20%
10.0%
4.50%
1.60%
3.45%
1
6
A hydrocarbon is found to be 85.6% carbon by mass. What is the empirical formula for this compound?
A CH
B CH2
C C3H
D C6H
E CH6
7
When 20.0 g of ethane and 64.0 g of oxygen gas react, how many grams of water are formed?
A
B
C
D
E
8
15.4 g
18.0 g
58.0 g
20.0 g
6.70 g
Given the equation 3A + B g C + D, you react 2 moles of A with 1 mole of B. Is the following true or false? A is the limiting reactant because you need 3 moles of A and have 2.
True False 9
The molecular formula always represents the total number of atoms of each element present in a compound.
True False 10 The reactant with the highest molar mass is always the limiting reactant.
True False 2
11 A 20.0 g sample of HF is dissolved in water to give 2.0 x 10 mL of solution. the concentration of the solution is:
1.0 M
A
3.0 M
B
0.10 M
C
5.0 M
D
10.0 M
E
2
12 What mass of solute is contained in 250 mL of a 0.800 M ammonium chloride solution?
A
B
C
D
E
10.7 g
13.7 g
47.9 g
53.5 g
107 g
13 What volume of 18.0 M sulfuric acid must be used to prepare 15.5 L of 0.195M H2SO4?
A
B
C
D
E
168 mL
0.336 L
92.3 mL
226 mL
21.9 mL
14 The empirical formula of styrene is CH; its molar mass is 104.1. What is the molecular formula of styrene?
A
B
C
D
E
C2H4
C8H8
C10H12
C6H6
C4H4
15 Consider the following reaction: 2A + B g 3C + D. 3.0 mol A and 2.0 mol B react to form 4.0 mol C. What is the percent yield of this reaction?
A 50 % B 67% C 75% D 89% E 100%
1. E (3 sig figs)
2. 28.09
3. E
4. A
5. D
6. B
7. E
8. True
9. True
10. False
11. D
12. A
13. A
14. B
15. D
3
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