Exam1B - Name: _ Date: _ VERSION B Part 1....

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Name: __________________________ Date: _____________ VERSION B Part 1. Calculation/Short Answer problem (6 points each). Select the best answer from the given choices and MARK IT ON YOUR SCANTRON. 1. Calculate the Br-Br bond enthalpy given the standard enthalpies of formation for Br 2 (g) and Br(g), 30.7 and 112 kJ mol 1 , respectively. A) 81 kJ mol 1 B) 255 kJ mol 1 C) 143 kJ mol 1 D) 193 kJ mol 1 E) 30.7 kJ mol 1 2. Rank the standard molar entropy of the following from lowest to highest. 1. H 2 O(l) 2. H 2 O(g) 3. H 2 O 2 (l) 4. H 2 O 2 (aq) A) 1<3<4<2 B) 4<1<3<2 C) 3<1<4<2 D) 2<4<3<1 E) 1<3<2<4 3. What is the total motional contribution to the molar internal energy of gaseous BF 3 ? A) RT B) 3.5RT C) 1.5RT D) 3RT E) 2.5RT 4. Use Trouton's constant to estimate the enthalpy of vaporization of benzene, which boils at 353 K. A) +85 kJ mol 1 B) +3.6 kJ mol 1 C) +275 kJ mol 1 D) 85 kJ mol 1 E) +30 kJ mol 1 Page 1
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VERSION B Name___________________________________ Student ID______________________ 5. A CD player and its battery together do 500 kJ of work, and the battery also releases 250 kJ of energy as heat, and the CD player releases 50 kJ as heat due to friction from spinning. What is the change in internal energy of the system, with the system regarded as the battery alone? Assume that the battery does 500 kJ of work on the CD player,
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This note was uploaded on 01/31/2010 for the course CHEM CHEM 6B taught by Professor Christinajohnson during the Spring '07 term at UCSD.

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Exam1B - Name: _ Date: _ VERSION B Part 1....

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