For a particular reaction at 135.4 °C, Δ=−775.41 kJ/mol
, and Δ=817.91 J/(mol⋅K)
.

Calculate ΔG for this reaction at 12.7
°C.

Explanation:

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In this case, for this problem, it is possible to use the thermodynamic definition of the Gibbs free energy:

Whereas G, H and S can be assumed as constant over T; thus, we can calculate H at 135.4 °C:

Now, we can calculate the Gibbs free energy at 12.7 °C as shown below:

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