For the reaction 3C2H2(g)---> C6H6(l) at 25 C the standard enthalpy change is -631 kj and the standard entropy change is -430 J/K. Calculate the standard free energy change at 25 C?

Given :

Temperature , T = 25°C = (25 + 273) K = 298 K .

The standard enthalpy change , .

The standard entropy change , .

To Find :

The standard free energy change at 25° C .

Solution :

Standard free energy is given by :

Therefore , the standard free energy change at 25° C is -502.86 kJ .

Hence , this is the required solution .

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