1. The combustion of ammonia in the presence of excess oxygenyields NO2(g) and H2O(g):

4NH3(g) + 7O2(g) → 4NO2(g) + 6H2O(g)
The combustion of 43.9 mg of ammonia produces how many grams ofNO2(g)?
A. 178
B. 0.119
C. 43.9
D. 0.954
E. 2.58

2. Calcium carbide, CaC2(s), reacts with water to produceacetylene, C2H2(g): CaC2(s) + 2H2O(g) → Ca(OH)2(s) + C2H2(g)Production of 13 g of C2H2(g) requires consumption of how manygrams of H2O(g)?
A. 18
B. 0.048
C. 9.0
D. 480
E. 4.5

3. How many moles of oxygen, O2, are needed for the completecombustion of 5.00 g of octane (C8H18)?
A. 0.111 mole
B. 1.10 mole
C. 0.547 mole
D. 0.333 mole
E. 2.20 mole

4. When aqueous solutions of Fe2(SO4)3(aq) and Pb(NO3)2(aq) aremixed, an insoluble salt forms. Which of the following representsthe correct net ionic equation that describes this reaction?
A. Fe3+(aq) + 3NO3-(aq) → Fe(NO3)3(s)
B. Fe3+(aq) + SO42-(aq) + Pb2+(aq) + 3NO3-(aq) → Fe(NO3)3(s) +PbSO4(s)
C. 2Fe3+(aq) + 3SO42-(aq) + 3Pb2+(aq) + 6NO3-(aq) →2Fe(NO3)3(s) + 3Pb2+(aq) + 3SO42-(aq)
D. Pb2+(aq) + 2NO3-(aq) → Pb(NO3)2(s)
E. Pb2+(aq) + SO42-(aq) → PbSO4(s)

5. The fermentation of glucose, C6H12O6, produces ethyl alcohol,C2H5OH, and carbon dioxide. How many grams of glucose are needed toform 7.50 g of ethanol?
A. 44.0 g
B. 58.7 g
C. 29.3 g
D. 11.2 g
E. 14.7 g