Exam 2 Fall 2010

# A b the volume will be halved the volume will double

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Unformatted text preview: e volume will not change The volume will quadruple 19. The following reaction occurs at constant pressure and temperature. If 3.0 L of CO(NH2)2 and 3.0 L of NO react with excess oxygen gas, what would the theoretical yield of CO be in liters? 2 CO(NH2)2(g) + 4 NO(g) + O2(g) 4 N2(g) + 2 CO(g) + 4 H2O(g) A. B. 20. 3.0 L 6.0 L C. D. 1.5 L 4.0 L What volume will 48.6 g of CO2 occupy at STP? A. B. 21. 10.7 L 0.765 L C. D. 95.5 L 24.7 L The volume occupied by 0.750 g of a gas at 100 C and 712 mmHg was determined to be 265 mL. What is the molar mass of the gas? A. B. 18.0 g/mol 32.1 g/mol C. D. 54.6 g/mol 92.5 g/mol 22. A syringe contains 589 mL of CO gas at 325 K and 1.2 atm of pressure. A second syringe contains 473 mL of N2 gas at 298 K and 2.6 atm. What is the final pressure if the contents of these two syringes are injected into an empty 1.00 L container at 273 K? A. B. 23. 0.59 atm 1.1 atm C. D. 1.7 atm 1.9 atm What volume of H2S gas is required to produce 55.0 g of sulfur? Assume that excess SO2 is present and that the reaction is conducted at 375 K and 1.20 atm. 2 H2S(g) + SO2(g) 3 S(s) + 2 H2O(g) A. B. 24. 44.0 L 29.3 L C. D. 22.7 L 34.1 L Which statement is TRUE about kinetic molecular theory? A. B. C. D. 25. Gas molecules do not move in a straight line. The average kinetic energy of a gas molecule is not proportional to the temperature. The volume of a gas molecule is large compared to the total volume occupied by the gas. The collisions of gas molecules with one another are completely elastic. A gas expands and absorbs 35 kJ of heat. What are the signs for work and heat for the system, respectively? A. B. C. D. Work (w) is positive (+); heat (q) is positive (+) Work (w) is negative (); heat (q) is negative () Work (w) is negative (); heat (q) is positive (+) Work (w) is positive (+); heat (q) is negative () 26. Calculate the change in internal energy ( E) for a system that releases 45.0 kJ of heat and does 855 J of work on the surroundings. A. B. 27. 44.1 kJ 44.1 kJ C. D. 45.9 kJ 45.9 kJ Energy that is associated with the position or composition of an object is called A. B. 28. potential energy thermal energy C. D. kinetic energy mechanical energy Under what conditions would N2 gas be the most ideal? A. B. C. D. High pressure and low temperature Low pressure and high temperature High pressure and high temperature Low pressure and low temperature...
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