Chemistry Manual 2012-2013 - Edison State College

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Blake Schmidt - Unit 10 Page 56 U10 EP3 Unit 10: Example Problems 3 Gas Stoichiometry 1. When calcium carbonate is heated strongly, carbon dioxide gas is evolved. CaCO3(s) → CaO(s) + CO2(g) If 4.74 g of calcium carbonate is heated, what volume of CO 2(g) would be produced when collected at STP? 2. Zinc metal reacts vigorously with chlorine gas to form zinc chloride. What volume of chlorine gas at 25˚C and 1.00 atm is required to react completely with 1.13 g of zinc? 3. Consider the following reaction: P4(s) + 6 H2(g) ––> 4 PH3(g) What mass of P4 will completely react with 2.50 L of hydrogen gas at 0˚C and 1.50 atm pressure? 4. If water is added to magnesium nitride and heated, ammonia gas is produced. Mg3N2(s) + 3H2O(l) ––> 3 MgO + 2NH3(g) If 10.3 g of magnesium nitride is treated with water, what volume of ammonia gas would be collected at 20˚C and 0.989 atm? 5. Nitrogen gas and hydrogen gas combine to produce ammonia gas. What volume of hydrogen gas at 25˚C and 735 mmHg is required for the complete reaction of 10.0 g of nitrogen?
Blake Schmidt - Unit 10 Page 57 U10 EP4 Unit 10: Example Problems 4 Energy Stoichiometry 1. How many kJ of heat will be released when 4.72 g of carbon reacts with excess oxygen gas to produce carbon dioxide? C + O2 CO2 ∆H° = –393.5 kJ 2. How much heat should be transferred when 38.2 g of liquid bromine reacts with excess hydrogen gas to form hydrogen bromide? Is the heat being transferred from the system to the surroundings or from the surroundings to the system? H2 + Br2 2 HBr ∆H° = 72.80 kJ 3. How many kJ of heat would you expect to be transferred when 6.44 g of sulfur react with excess oxygen to produce sulfur trioxide? Is this reaction endothermic or exothermic? 2 S + 3 O2 2 SO3 ∆H° = –791.4 kJ 4. Nitrogen gas and oxygen gas can combine to produce nitric oxide, NO. If such a reaction absorbs 88.0 kJ of heat from the surroundings, how many grams of nitrogen gas do you predict were consumed in the reaction? N2 + O2 2 NO ∆H° = 180 kJ 5. Ammonia gas combines with excess oxygen gas to produce nitric oxide and water. If 256 kJ of energy were released in such a reaction, how many grams of ammonia gas were reacted? 4 NH3 + 5 O2 4 NO + 6 H2O ∆H° = – 1170 kJ 6. Carbon in the form of graphite combines with excess hydrogen gas to form benzene, C6H6. In the following reaction 3.95 kJ of heat were transferred. Calculate the grams of graphite reacted. Is the reaction endothermic or exothermic? 6 C + 3 H2 C6H6 ∆H° = 49.03 kJ 7. How much heat will be released if 30.0 g of octane (C8H18) is burned in excess oxygen? C8H18+ 12 1/2 O2 8 CO2+ 9 H2O ∆H° = –5483.4 kJ How much heat would be released by burning one gallon of octane? The density of octane is 0.703g/mL. 1 gallon = 3.79 liters.
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Chemistry Manual 2012-2013 - Edison State College

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