For the physical equilibrium , the standard free energy change can be directly calculated if which of the following is experimentally known at the given temperature?

Question

For the physical equilibrium $H_2O(l) \rightleftharpoons H_2O(g)$, the standard free energy change $\Delta G^\circ$ can be directly calculated if which of the following is experimentally known at the given temperature?

Prashant Kotian · Accepted Answer

Correct answer: C. The equilibrium constant for this heterogeneous phase change is exactly (Vapour Pressure). Thus, applying the isotherm equation yields .

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