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Stoichiometry
Test Description: Chapter 12 Test
Instructions: Answer all questions to get your test result.
1) What is the theoretical yield of carbon dioxide if you begin a combustion reaction with 25.6g of C8H20 and 17.2g of oxygen gas?
A
14.6g carbon dioxide
B
77.5g carbon dioxide
C
44.1g carbon dioxide
D
7.45g carbon dioxide
2) What is the theoretical yield of water if you begin a combustion reaction with 25.6g of C8H20 and 17.2g of oxygen gas?
A
18.0g water
B
7.45g water
C
77.5g water
D
14.6g water
3) If your theoretical yield is 14.6g of carbon dioxide, and you mass out 5.23g of carbon dioxide in lab, what is your percent yield?
A
.358%
B
70.2%
C
35.8%
D
279%
4) If you end up with 65.3% yield, how much zinc sulfate did you make in lab if your theoretical yield is 201g of zinc sulfate?
A
.653g zinc sulfate
B
131g zinc sulfate
C
65.3g zinc sulfate
D
161g zinc sulfate
5) If you end up with 70.4% yield, how much sodium nitrate did you make in lab if your theoretical yield is 8.52g of sodium nitrate?
A
.704g sodium nitrate
B
25.0g sodium nitrate
C
6.00g sodium nitrate
D
8.52g sodium nitrate
6) Which of the follow is a balanced chemical reaction?
A
2 Pb(NO3)2 (aq) + 3 NaI (aq) → 2 PbI2 (s) + 3 NaNO3 (aq)
B
Pb(NO3)2 (aq) + NaI (aq) → PbI2 (s) + NaNO3 (aq)
C
2 Pb(NO3)2 (aq) + 4 NaI (aq) → 2 PbI2 (s) + 4 NaNO3 (aq)
D
Pb(NO3)2 (aq) + 2 NaI (aq) → PbI2 (s) + 2 NaNO3 (aq)
7) Which of the follow is a balanced chemical reaction?
A
C8H20 (l) + 13 O2 (g) → 8 CO2 (g) + 10 H2O (l)
B
2 C8H20 (l) + 13 O2 (g) → 10 CO2 (g) + 8 H2O (l)
C
C8H20 (l) + 7 O2 (g) → 8 CO2 (g) + 10 H2O (l)
D
C8H20 (l) + O2 (g) → CO2 (g) + H2O (l)
8) What is the percent yield of product if you produce 15.3 g of product in the lab and your theoretical yield is 13.1g?
A
117%
B
85.6%
C
116%
D
.856%
9) In the lab, you perform a combustion reaction. 2 C2 H6 (l) + 7 O2 (g) → 4 CO2 (g) + 6 H2 O(l) If 35.65 g of C2H6 and 45.27 g oxygen were used how much carbon dioxide was formed?
A
45.27g carbon dioxide
B
35.58g carbon dioxide
C
104.4g carbon dioxide
D
35.62g carbon dioxide
10) The reaction of calcium hydroxide and sulfuric acid yields calcium sulfate and water. You begin with 2.305 g of calcium hydroxide and 5.347 g of sulfuric acid. • Write the chemical reaction and balance from the word chemical reaction above.
A
Ca(OH)2 (aq) + H2SO4 (aq) → CaSO4 (s) + 2 H2O (l)
B
CaOH (aq) + H2S (aq) → CaS (s) + 2 H2O (l)
C
Ca(OH)2 (aq) + H2SO4 (aq) → 2 CaSO4 (s) + 2 H2O (l)
D
CaOH (aq) + HSO4 (aq) → CaSO4 (s) + H2O (l)
*select an answer for all questions
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