Take the value of R = 8.314 J K1 mol1 and 0 °C = 273.15 K. The equilibrium constant was measured for a certain chemical reaction from 500 °C to

550 °C. The results are given below. (a) Determine from the data the value of A,H° / kJ mol1, A„G° / kJ mol1 and A,S /J K1 mol1 at 500 K. State any approximation you make. (b) Estimate the values of 4,H° / kJ mol1, 4,G° / kJ mol1 and 4,5° /JK' mol1 at 298 K. State any approximation you make. How reliable is your estimate in (b)? Give a reason for your answer.