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CH20_therm_prob

# CH20_therm_prob - Extra Problems for Chapters 12 and 20 1...

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Extra Problems for Chapters 12 and 20 1. The standard molar entropies for H 2 , D 2 , and HD are 130.57, 144.96, and 143.80 J K 1 mol 1 , respectively. a) Why is the value of S o for HD higher than the average of the S o ’s for hydrogen and deu- terium, i.e. , why isn’t it about 137.77 [= (130.57 + 144.96) / 2]? b) What is Δ S o for the reaction 2 HD( g ) H 2 ( g ) + D 2 ( g ) [-12.07 J K 1 ] 2. At a pressure of 1 atm water freezes at 273.15 K. Δ H fus (H 2 O) = 6.007 kJ mol 1 . Assume Δ H and Δ S are independent of temperature. a) Calculate Δ S univ for one mole of water freezing at -10 o C, 0 o C, and 10 o C. [-0.8, 0, and 0.8 J/K] b) Calculate Δ G for one mole of water freezing at -10 o C, 0 o C, and 10 o C. [-220, 0, and 220 J] c) At which of the above temperatures is the freezing spontaneous, nonspontaneous, or at equilibrium?

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-2- 3. For the following reactions assume that Δ H and Δ S are independent of temperature and determine the temperature at which the reaction becomes spontaneous.
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CH20_therm_prob - Extra Problems for Chapters 12 and 20 1...

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