The problem can be solved using the relation
∆G = ∆H - T∆S
Where ∆G = Gibbs free energy
∆H = enthalpy change
∆S = entropy change.
First of all the value of ∆H for reaction at 239.1°C can be calculated. As this value will be independent of temperature, so the value of of ∆G at any other temperature can be calculated using same equation.
The problem is solved in the picture attached below.
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