1178564544Xuj - Anderson Kiel Homework 1 Due midnight Inst...

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Anderson, Kiel – Homework 1 – Due: Jan 26 2007, midnight – Inst: McCord 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This homework has some Chapter 7 ques- tions and then gets into Chapter 8. You should recognize the first question as an isothermal expansion which is discussed in both Chapter 6 and in Chapter 7. 001 (part 1 of 1) 10 points Calculate ΔG for the process He(g , 1 atm , 298 K) He(g, 10 atm, 298 K) 1. 2.10 kJ/mol 2. 3.90 kJ/mol 3. 3.50 kJ/mol 4. 4.80 kJ/mol 5. 5.70 kJ/mol correct Explanation: 002 (part 1 of 1) 10 points A reversible reaction is at equilibrium at con- stant pressure and temperature if the free energy of the system 1. is zero. 2. increases. 3. is a maximum. 4. is a minimum. correct 5. decreases. Explanation: A system is at equilibrium when Δ G = 0. A system is spontaneous when Δ G is negative and non-spontaneous when Δ G is positive. Call Gibbs Free Energy at equilibrium G equil . If the system moves towards spontane- ity, G equil < G spont for Δ G to be negative. Threfore, Δ G equil must be a minimum. 003 (part 1 of 1) 10 points A reaction for which Δ H is positive and Δ S is negative 1. could become spontaneous at high tem- peratures. 2. is not spontaneous at any temperature. correct 3. could become spontaneous at low temper- atures. 4. is spontaneous at any temperature. Explanation: T = (+) , Δ H = (+) and Δ S = ( - ) Δ G = Δ H - T Δ S Δ G = (+) - (+)( - ) = (+) - ( - ) = (+) + (+) Δ G will always be positive, so the process will always be nonspontaneous. 004 (part 1 of 1) 10 points Liquid metallic zinc (Zn) has a vapor pressure of 40 torr at 673 C and 100 torr at 736 C.
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