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Gas Worksheet #3 – Molar Volume and Gas Stoichiometry

Solve problems using dimensional analysis. You may have to write a balanced chemical equation for some of the problems. Show all work, answers are given at the end of the problem.

Molar Volume

1. Calculate the number of moles contained in 550.mL of carbon dioxide at STP. (0.0246mol)

2. Calculate the mass of 1.50 L of CH4 at STP. (1.07g)

3. Calculate the volume in liters of 50.0 grams of nitrogen dioxide at STP. (24.3L)

Gas Stoichiometry

1. Given the following reaction: NH4NO2 (s)( N2 (g) + 2H2O (g) How many liters of nitrogen gas is produced if 50.0L of water is produced at STP? (25.0L)

2. Given the following reaction: CuO (s) + H2 (g) ( Cu (s) + H2O (g) If 250. L of hydrogen gas are used to reduce copper (II) oxide at STP, what mass of copper is to be expected? (709g)

3. How many grams of solid lithium must be added to liquid water in order to obtain 15.0 L of hydrogen gas at STP? (9.29g)

4. When black gunpowder explodes, solid potassium nitrate, solid carbon, and solid sulfur react with each other to form nitrogen gas, carbon dioxide gas, and solid potassium sulfide. If the original mixture contains 50.0 grams of potassium nitrate, what volume of carbon dioxide is produced in the reaction at STP? (16.6L)

5. Calculate the volume of hydrogen gas at produced by the reaction of 0.52 grams of solid magnesium with excess hydrochloric acid. (0.48L)

6. How many liters of hydrogen gas are needed to react completely with 50.0 L of chlorine gas at STP? How many liters of hydrogen chloride gas is produced in the reaction? (a.50.0L; b.100.L)

7. Given the following reaction: 2NO (g) + O2 (g) ( 2NO2 (g) How many liters of gaseous oxygen are needed to produce 4.50 L of gaseous nitrogen dioxide, if both gases are being measured at STP? (2.25L)

8. Given the following reaction: N2 (g) + 3H2 (g)( 2NH3 (g) If 200. L of ammonia are produced in the reaction between nitrogen and hydrogen at STP, how many liters of nitrogen and hydrogen gases are used up in this reaction? (100. L nitrogen, 300. L hydrogen)

9. Given the following reaction: F2 (g) + H2 (g)( 2HF (g) If 30.0 L of fluorine gas are exposed to 50.0 L of hydrogen gas at STP which is the limiting reactant? Which is the excess? How many liters of hydrogen fluoride are formed in this reaction? (fluorine is limiting, hydrogen is excess, 60.0L)

10. If 1800.L of C2H2 are burned in oxygen, how many liters of carbon dioxide gas are formed? (3600.L)

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