Chapter 12 Practice Problems
Name ____________________________________
1. The thermite reaction has been used to weld railroad tracks. The reaction is
Fe 2 O 3 (s) + 2Al(s)  2Fe(s) + Al 2 O 3 (s)
A. How many grams of aluminum would be needed to produce 15.0g of iron?
B. How many grams of iron(III)oxide would be needed to produce 15.0g of iron?
C. How many grams of aluminum oxide would be formed if 15.0 g of iron were formed?
2. Ammonia is produced by the reaction of nitrogen and hydrogen according to this balanced equation.
N 2 (g) + 3H 2 (g)  2NH 3 (g)
A. What mass of ammonia would be produced if 13.4 g of nitrogen gas reacted?
B. What mass of ammonia would be produced if 13.4 g of hydrogen gas reacted at STP?
C. What volume of ammonia would be produced if 13.4 g of nitrogen gas reacted at STP?
D. What volume of ammonia would be produced if 13.4 g of hydrogen gas reacted at STP?
E. What volume of ammonia would be produced if 13.4 L of nitrogen gas reacted at STP?
F. What volume of ammonia would be produced if 13.4 L of hydrogen gas reacted at STP?
G. How many molecules of ammonia would be produced if 13.4 g of nitrogen gas reacted at STP?
H. How many molecules of ammonia would be produced if 13.4 g of hydrogen gas reacted at STP?
3. Given the following balanced equation
4Hg( l )  O2 (g)  2Hg 2O(s)
A. What mass of mercury is necessary to produce 23.7 g of mercury (I) oxide?
B. What volume of oxygen gas will be required to produce the same amount of mercury (I) oxide at STP?
C. How many grams of oxygen will be required to react with 67.3 g of mercury?
4. How many grams of water vapor will be produced when 1.18 grams of hydrogen gas react completely with
oxygen?
5. How many grams of water vapor will be produced when 1.18 grams of oxygen gas react completely with
hydrogen?
6. How many grams of silver iodide can be produced from 52.38 g of iodine and unlimited silver?
7. If 46.2 g of sulfur trioxide decompose, how many liters of oxygen will be produced at STP?