If 0.1500 mol of O2 is placed in an empty 32.80L container and equilibrium is established at 4000K, one finds the pressure is 2.175 atm. Find Kp and Delta G for the reaction O2 (g) <--> 2 O (g) at 4000 K. Assume ideal gases
Kp = (P2O)2/(PO2) = (2.175)2/(0.1500) = 29.06
Delta G = -RTlnKp = -(8.314 J/molK)(4000K)ln(29.06) = -2.945 x 10^4 J/mol