6. Consider the reaction 2CuO(s)2Cu(s)+O2(g). The following data are given at 25C a) Show that lnK(T2)=lnK(T1)RrxnH(T1)(T21T11)+RT1rxncpm(T21T11)+Rrxncpmln(T1T2) when heat capacities are independent of temperature, but the rxnH is not. b) Write the expression for K in terms of the pressure of O2. c) Using the result from part (a), calculate the equilibrium pressure of oxygen over copper and CuO (s) at 1200K. d) What value would you obtain for the equilibrium pressure if you assumed that rxnH was constant at its value of 298.15K up to 1200K ? (Ans. K=PPo2;3.78105 bar; 6.20105 bar)