Consider the decomposition of calcium carbonate Assume that

Consider the decomposition of calcium carbonate. Assume that ?H

Solution

CaCO3(s) CaO(s)+ CO2(g) Kp = PCO2(g) a) ?Go = ?Ho - T?So = 177.8 kJ/mol - 298 K * 160.5 x 10-3 kJ/K.mol = 129.9 kJ ?Go = -RT lnKp 129.9 kJ = - 8.314 x 10-3 kJ/K.mol * 298 K *lnKp ? Kp = 1.69 x 10-23 ? PCO2(g) = 1.69 x10-23 atm 2. ?Go = ?Ho - T?So = 177.8 kJ/mol - 1024K * 160.5 x 10-3kJ/K.mol = 13.44 kJ ?Go = -RT lnKp 13.44kJ = - 8.314 x 10-3 kJ/K.mol * 1024 K* lnKp ? Kp = 0.206 ? PCO2(g) = 0.206 atm