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# HW12 - Owlia Arria Homework 12 Due Dec 4 2007 midnight Inst...

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Owlia, Arria – Homework 12 – Due: Dec 4 2007, midnight – Inst: Vandenbout 1 This print-out should have 32 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. EXAM 4 is Thursday, 12/6 from 7-9 PM Go to the right room A-K WEL 1.316 L-O WEL 2.122 P-Z WEL 1.308 001 (part 1 of 1) 10 points For a given transfer of energy, a greater change in disorder occurs when the temperature is high. 1. True 2. False 002 (part 1 of 1) 10 points Entropy is a state function. 1. True 2. False 003 (part 1 of 1) 10 points Place the following in order of increasing en- tropy. 1. solid, liquid, and gas 2. solid, gas, and liqiud 3. liqiud, solid, and gas 4. gas, solid, and liqiud 5. gas, liqiud, and solid 004 (part 1 of 1) 10 points Which substance has the higher molar en- tropy? 1. Ne(g) at 298 K and 1.00 atm 2. Unable to determine 3. They are the same 4. Kr(g) at 298 K and 1.00 atm 005 (part 1 of 1) 10 points Calculate the standard entropy of vaporiza- tion of ethanol at its boiling point 352 K. The standard molar enthalpy of vaporization of ethanol at its boiling point is 40.5 kJ · mol - 1 . 1. +40.5 kJ · K - 1 · mol - 1 2. +115 J · K - 1 · mol - 1 3. +513 J · K - 1 · mol - 1 4. - 115 J · K - 1 · mol - 1 5. - 40.5 kJ · K - 1 · mol - 1 006 (part 1 of 1) 10 points Assuming that the heat capacity of an ideal gas is independent of temperature, what is the entropy change associated with lowering the temperature of 5 . 03 mol of ideal gas atoms from 101 . 87 C to - 45 . 77 C at constant pres- sure? Answer in units of J / K. 007 (part 1 of 1) 10 points What is the entropy change associated with the isothermal compression of 6 . 64 mol of ideal gas atoms from 9 atm to 12 . 65 atm? Answer in units of J / K. 008 (part 1 of 1) 10 points What is the entropy change for freezing 2 . 68 g of C 2 H 5 OH at 158 . 7 K? Δ H = - 4600 J / mol. Answer in units of J / K. 009 (part 1 of 1) 10 points

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Owlia, Arria – Homework 12 – Due: Dec 4 2007, midnight – Inst: Vandenbout 2 Suppose that 130 g of ethanol at 24 C is mixed with 225 g of ethanol at 58 C at constant atmospheric pressure in a thermally insulated vessel. What is the Δ S sys for the process?
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HW12 - Owlia Arria Homework 12 Due Dec 4 2007 midnight Inst...

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