Calculate H, S, and G at 298 K for each ofthe following reactions. In each case

Question

Calculate H, S, and G at 298 K for each ofthe following reactions. In each case show thatG=H-TS. A) H2(g) + F2(g)--->2HF(g) B) C(s graphite) + 2Cl2(g) ---->CCl4(g) C) 2PCl3(g) + O2(g)---->2POCl3(g) D) 2CH3OH(g) + H2(g)-----> C2H6(g) +2H2O(g) Calculate H, S, and G at 298 K for each ofthe following reactions. In each case show thatG=H-TS. A) H2(g) + F2(g)--->2HF(g) B) C(s graphite) + 2Cl2(g) ---->CCl4(g) C) 2PCl3(g) + O2(g)---->2POCl3(g) D) 2CH3OH(g) + H2(g)-----> C2H6(g) +2H2O(g) D) 2CH3OH(g) + H2(g)-----> C2H6(g) +2H2O(g)

Explanation / Answer

             2POCl3(g)----->2PCl3(g)+ O2(g)

            G°= H° - TS°

            G°= 572 kJ - 298 K x 179 J/K x 1kJ/103J = +519 kJ

            Thereaction will be nonspontaneous at this temperature becauseG°rxn < 0.

            Fora reaction to be spontaneous, G° < 0.

           H° - TS° < 0

            T> H°/S° > 572 kJ/(179 J/Kx 1 kJ/103J) > 3.20 x 103K

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