summer 2006 exam2 master

summer 2006 exam2 master - master 1 NAME General Chemistry...

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master NAME: ______________________ SECTION:_____ General Chemistry 115 Exam 2 April 5, 2004 h = 6.63 x 10 -34 J . s 1 nm = 1 x 10 -9 m c = 3.00 x 10 8 m/s R H = 2.18 x 10 -18 s of H 2 O = 4.184 J/g C R = 0.0821 L . atm/ K . mol = 8.314 J/ K . mol 1 L . atm = 101.3 J 1 atm = 760 torr 1. A gas at constant volume of 2.99 L is cooled from 101 degrees C to -56.0 degrees C. The initial pressure is 741 mm Hg. Predict the new pressure. a. 430 mm Hg b. 678 mm Hg c. 384 mm Hg d. 963 mm Hg e. 1.32 x 10 2 mm Hg f. 2.40 x 10 2 mm Hg g. 1.18 x 10 3 mm Hg h. 9.03 x 10 2 mm Hg 2. Consider this equation. 3Fe 2 O 3 (s) + CO (g) 2Fe 3 O 4 (s) + CO 2 (g) H = -48.5 kJ If 1.00 x 10 2 grams Fe 2 O 3 is reacted with 1 equivalent carbon monoxide at a constant the pressure of 1.00 atm and temperature of 25 degrees C, what was the change in internal energy ( E) in this process, assuming the reaction goes to completion? Assume solids have negligible volume. a. - 10.1 kJ b. 36.3 kJ c. - 5.14 x 10 2 kJ d. 793 kJ e. - 3.08 x 10 3 kJ f. 23.6 kJ g. - 8.73 kJ h. - 8.19 x 10 -2 kJ 1 1
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master 3. Consider the following equation: NH 4 NO 3 (s) N 2 O (g) + 2H 2 O (g) 19.9 g ammonium nitrate is reacted at 100 degrees C. The reaction has 100 percent yield. The products are collected in a 15.0 L container. What is the partial pressure of H 2 O gas? a. 1.02 atm b. 2.31 atm c. 3.94 x 10 -1 atm d. 1.48 atm e. 1.03 x 10 -1 atm f. 0.896 atm g. 0.435 atm h. 0.28 atm 4. 251 gram Hg rises in temperature from 5.00 degrees C to 48.0 degree C. Specific heat for Hg is 0.139 J/g C. What is q? a. 1.50 kJ b. 8.47 kJ c. -16.2 kJ d. 4.01 kJ e. 1.04 kJ f. -10.8 kJ g. -14.8 kJ h. 9.26 kJ 5. Use the following thermochemical equations to find the standard enthalpy of this equation: PCl 3 (l) + Cl 2 (g) PCl 5 (s) P 4 (s) + 6Cl 2 (g) 4PCl 3 (l) H rxn = -1280 kJ/mole P 4 (s) + 10Cl 2 (g) 4PCl 5 (s) H rxn = -1774 kJ/mole a. -124 kJ/mole b. 165 kJ/mole c. -6.19 x 10 -2 kJ/mole d. -5.02 x 10 2 kJ/mole e. 725 kJ/mole f. 438 kJ/mole g 46.7 kJ/mole h -43.4 kJ/mole 2 2
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This note was uploaded on 05/04/2008 for the course CHEM 115 taught by Professor Blank during the Spring '08 term at Rutgers.

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summer 2006 exam2 master - master 1 NAME General Chemistry...

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