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 P: 10 You need to solve the following equation: $\Delta G = \Delta H - T \Delta S$. You know $\Delta G$ and $T$, which leaves two unknowns: $\Delta H$ and $\Delta S$. You cannot solve for two unknowns with a single equation: you need to have two sets of values. The way to do this is to solve the following set of simultaneous equations, using the value of $\Delta G$ and two different temperatures. $\Delta G_{(1)} = \Delta H - T_{(1)} \Delta S$ $\Delta G_{(2)} = \Delta H - T_{(2)} \Delta S$ The difference between these two $\Delta G$ values isn't negligible- $\Delta G$ is a temperature dependent quantity!