CH 301 Quiz 4 - Wright, Jacqueline – Quiz 4 – Due: Apr...

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Unformatted text preview: Wright, Jacqueline – Quiz 4 – Due: Apr 18 2007, 11:00 pm – Inst: Sara Sutcliffe This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points 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, which then does the same amount of work on the surroundings. 1. −700 kJ 2. −50 kJ 3. −750 kJ 4. +200 kJ 5. −800 kJ 002 (part 1 of 1) 10 points Calculate the energy in calories to heat 372 g of mercury from 37 ◦ C to 42 ◦ C. The specific heat capacity of Hg( ) is 0.138 J/g ·◦ C. Answer in units of cal. 003 (part 1 of 1) 10 points The specific heat for liquid argon Ar( ) is 20.8 J 25.0 J and gaseous Ar(g) is . The ◦C mol · mol ·◦ C enthalpy of evaporation is 6506 J/mol. How much energy is required to convert 1 mole of liquid Ar from 5◦ C below its boiling point to 1 mole of gaseous Ar 5◦ C above its boiling point? 1. 6495 J 2. 6290 J 3. 6735 J 4. 6960 J 5. 6555 J 1 004 (part 1 of 1) 10 points Which is USUALLY larger, the heat of vaporization or the heat of fusion? 1. the heat of fusion 2. Cannot be determined 3. They are equal. 4. the heat of vaporization 005 (part 1 of 1) 10 points The combustion of one mole of octane (C8 H18 ( )) in a bomb calorimeter released 5460 kJ of heat at 298 K. The products of the reaction are carbon dioxide and liquid water. What is the enthalpy change for this reaction? 1. −5460 kJ · mol−1 2. +5460 kJ · mol−1 3. −5449 kJ · mol−1 4. +5471 kJ · mol−1 5. −5471 kJ · mol−1 ...
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This note was uploaded on 12/08/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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