# Calculation of translational free energy in condensed phase

For gases, the reference volume in molecular calculations is usually understood to be 24.5 L whereas in solution, the reference volume usually is considered to be 1 L.

The free energy corrections from common computational chemistry programs (e.g. Gaussian or GAMESS) is usually with reference to 1 mol/24.5L and so I wonder how to correctly convert to the solution reference.

If I want the translational free energy with reference to 1 L at $T=298 K$, is it correct to calculate it as

$$G_{trans}(1L) = G_{trans}(24.5L) - RT \ln(24.5) ?$$

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