At 452.2 K, a total pressure of 95.9 kPa, and with an appropriate catalyst, the equilibrium extent of dissociation of pure isopropanol to acetone and hydrogen is found to be 56.4 percent [H. J. Kolb and R. L. Burwell, Jr., J. Am. Chem. Soc., 67, 1084 (1945)]. Use this information to calculate the standard-state Gibbs energy change for this reaction at this temperature.