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Problem Set #6, Chem 340, Fall 2013

Problem Set #6 solution, Chem 340, Fall 2013 Due Friday, Oct 11, 2013 Please show all work for credit To hand in: Atkins Chap 3 Exercises: (b), (b), (b), (b) Problems: , , , Engel Chap. 5: , , , Extras : Atkins Chap 3 Exercises: (b), (b), (b) Problems: , , , , , To hand in : Atkins Exercises: (b) Calculate S (for the system) when the state of mol diatomic perfect gas molecules, for which Cp,m = 7/2 R, is changed from 25 C and atm to 135 C and atm. How do you rationalize the sign of S? (b) Calculate the standard reaction entropy at 298 K of (a) Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s) (b) C12H22O11(s) + 12 O2(g) 12 CO2(g) + 11 H2O(l) (b) Calculate the change in the entropies of the system and the surroundings, and the total change in entropy, when the volume of a sample of argon gas of mass 21 g at 298 K and bar increases from dm3 to dm3 in (a) an isothermal reversible expansion, (b) an isothermal irreversible expansion against pex = 0, and (c) an adiabatic reversible expansion.

Engel P5.14) The standard entropy of Pb(s) at 298.15 K is 64.80 J K–1 mol–1.Assume that the heat capacity of Pb(s) is given by n C P, m Pb, s J mol 1 K 1 22.13 0.01172 T K 1.00 10 5 T2 K2 773.15 K The melting point is 327.4°C and the heat of fusion under these conditions is 4770.

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