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HW13_Problems

# HW13_Problems - triesault(njt298 H13 Thermo 2nd Law...

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triesault (njt298) – H13: Thermo - 2nd Law – McCord – (53740) 1 This print-out should have 32 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points For a given transfer of energy, a greater change in disorder occurs when the temperature is high. 1. True 2. False 002 10.0 points Entropy is a state function. 1. False 2. True 003 10.0 points Place the following in order of increasing en- tropy. 1. gas, solid, and liqiud 2. gas, liqiud, and solid 3. solid, liquid, and gas 4. solid, gas, and liqiud 5. liqiud, solid, and gas 004 10.0 points Which substance has the higher molar en- tropy? 1. They are the same 2. Unable to determine 3. Kr(g) at 298 K and 1.00 atm 4. Ne(g) at 298 K and 1.00 atm 005 10.0 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. +115 J · K 1 · mol 1 2. - 115 J · K 1 · mol 1 3. - 40.5 kJ · K 1 · mol 1 4. +40.5 kJ · K 1 · mol 1 5. +513 J · K 1 · mol 1 006 10.0 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 2 . 25 mol of ideal gas atoms from 102 . 13 C to - 35 . 27 C at constant vol- ume? Answer in units of J / K. 007 10.0 points What is the entropy change associated with the isothermal compression of 6 . 16 mol of ideal gas atoms from 9 . 13 atm to 12 . 65 atm? Answer in units of J / K. 008 10.0 points What is the entropy change for freezing 6 . 33 g of C 2 H 5 OH at 158 . 7 K? Δ H = - 4600 J / mol. Answer in units of J / K. 009 10.0 points Suppose that 160 g of ethanol at 24 C is mixed with 245 g of ethanol at 60 C at constant atmospheric pressure in a thermally insulated vessel. What is the Δ S sys for the process? The specific heat capacity for ethanol is 2.42 J/g K. Answer in units of J / K.

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