Chapter 12 Practice #2 - Simeon Ca



Chapter 12 Practice #2 Name ______________________________

Answer the following questions on a separate sheet of paper. Show your work, include the units and circle your answers.

1. The thermite reaction has been used to weld railroad tracks. The reaction is

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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.

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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

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?

4. If 2.87 g of aluminum are reacted with excess copper (II) sulfate and 9.2 g of copper are produced what is the percent yield

5. If 24.2 g of hydrogen react with excess oxygen and 3.45 g of water are produced what is the percent yield? 2H2 + O2 → 2H2O

6. When 3.8 g of aluminum are reacted with excess chlorine in the lab, you find you have made 7.8 g of aluminum chloride. What is the percent yield of this reaction?

2Al + 3Cl2→ 2AlCl3

7. If 2.35 moles of H2 gas react with 5.33 mol of N2 gas to make ammonia gas (NH3):

N2 + 3H2 ( 2 NH3

A. If you run out of H2 how many grams of NH3can you make?

B. If you run out of N2 how many grams of NH3 can you make?

C. In the mixture above, how many grams of NH3 can you make?

D. What is the limiting reagent?

E. How many moles of excess reagent will remain?

8. How many grams of NH3 can be produced if 28.0 g of N2 is reacted with 25.0 g of H2?

N2 + 3H2 ( 2 NH3

B. How much of the excess reagent were used?

C. How much of the excess reagent is left over?

9. What mass of silver phosphate can be produced if 250 grams of silver nitrate and 250 g of sodium phosphate are mixed?

3 AgNO3 + Na3PO4 ( Ag3PO4 + 3NaNO3

10. How many grams of silver iodide can be produced from 52.38 g of iodine and unlimited silver?

11. If 46.2 g of sulfur trioxide decompose, how many liters of oxygen will be produced at STP?

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