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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.

Problems: 3.1 Calculate the difference in molar entropy (a) between liquid water and ice at −5°C, (b) between liquid water and its vapour at 95°C and 1.00 atm. The differences in heat capacities on melting and on vaporization are 37.3 J K−1mol−1 and −41.9 J K−1 mol−1, respectively.Distinguish

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