Stoichiometry Unit Review

How many grams are equal to 1.50 moles of krypton?

.017

941

.983

.812

6

9.0

3 x

1023

9%0% 0%

91%

0%

1. .01792. 41.93. 83.84. 1265. 9.03 x 1023

1 2 3 4 5 6 7 8 9 10 11 12 13

How many moles of cobalt are equal to 4.7 x 1023 atoms of cobalt?

.08

.78

1.3 46

2.8

x 1

025

0%

89%

11%

0%0%

1. .0802. .783. 1.34. 465. 2.8 x 1025

1 2 3 4 5 6 7 8 9 10 11 12 13

How many moles of zirconium are equal to 270 grams of zirconium?

2.96

4.49

91.2

2462

9

1.7

8 x

1024

73%

0% 0%

27%

0%

1. 2.962. 4.493. 91.24. 24,6295. 1.78 x 1024

1 2 3 4 5 6 7 8 9 10 11 12 13

243.52 grams of antimony is equal to _______ mole(s) of antimony or _______ atom(s) of antimony.

1; 6

.02

x 10

23

2; 6

.02

x 10

23

2; 1

.20

x 10

24

.5; 1

.20

x 10

24 2

; 2

0%9%

0%0%

91%

1. 1; 6.02 x 1023

2. 2; 6.02 x 1023

3. 2; 1.20 x 1024

4. .5; 1.20 x 1024

5. 2; 2

1 2 3 4 5 6 7 8 9 10 11 12 13

What is the molar mass of sulfuric acid, H2SO4?

25 49 67 98 194

0%8%

0%

92%

0%

1. 252. 493. 674. 985. 194

1 2 3 4 5 6 7 8 9 10 11 12 13

Sodium sulfide and cadmium(II) nitrate undergo a double replacement reaction. What is the mass of cadmium sulfide

that can be produced from 5.00 g of sodium sulfide?Na2S + Cd(NO3)2 2 NaNO3 + CdS

0.3

4 g

0.6

4 g

4.6

9 g

9.3

8 g

18.

8 g

8%0% 0%

92%

0%

1. 0.34 g2. 0.64 g3. 4.69 g4. 9.38 g5. 18.8 g

1 2 3 4 5 6 7 8 9 10 11 12 13

Hydrogen and nitrogen gases can be combined to form ammonia gas, NH3. How many moles of N2 are required to

form 27.0 g of ammonia?3 H2 + N2 2 NH3

0.7

9 m

ol

1.5

9 m

ol

3.1

7 m

ol

44.

4 m

ol

88.

8 m

ol

42%

33%

0%0%

25%

1. 0.79 mol2. 1.59 mol3. 3.17 mol4. 44.4 mol5. 88.8 mol

1 2 3 4 5 6 7 8 9 10 11 12 13

How many grams of the excess reactant will remain when 10.0 g of silicon and 100 g of oxygen react?

Si + O2 → SiO2

0.0

g

21.

5 g

64.

8 g

88.

4 g

166

g

8%

33%

0%

58%

0%

1. 0.0 g2. 21.5 g3. 64.8 g4. 88.4 g5. 166 g

1 2 3 4 5 6 7 8 9 10 11 12 13

What is the percent yield if 35 grams of SO3 is produced from 50 grams of SO2?

2SO2 + O2 → 2SO3

15%

30%

56%

80%

94%

0% 0% 0%0%0%

30

1. 15%2. 30%3. 56% 4. 80% 5. 94%

1 2 3 4 5 6 7 8 9 10 11 12 13

Determine the percent yield of hydrogen if 12.5 grams of hydrogen is collected from the reaction of

500 g of zinc with 500 g of HCl.Zn(s) + 2HCl(aq) ↔ H2(g) + ZnCl2(aq)

14%

46%

77%

91%

110%

0% 0% 0%0%0%

30

1. 14%2. 46%3. 77% 4. 91%5. 110%

1 2 3 4 5 6 7 8 9 10 11 12 13

Participant Scores33 Alex Huiras33 Emily Szczepanski33 Mackenzie Sinnen33 Liz Theis33 Shawna Plier