What is the purpose of the “include molar volumes” check box in the Menu Window?
This option applies to condensed phases (pure solid and liquid compounds, and real solutions) and is only meaningful at very high pressures. For normal calculations it is recommended that you leave this box unchecked. When the “include molar volumes” box is checked, all solid and liquid phase molar volume data (including compressibility and expansivity data when available) will be employed in the VdP term. For such calculations it is recommended that you also select the “real gas” option in the Menu Window. Important note: if a species has no volume data, its molar volume is assumed to be zero and the calculation of the VdP term will be in error! This may cause unpredictable results at high pressures as it will tend to stabilize species with small (or zero in this case) molar volumes. Such species will be flagged with a ” o ” in the Results Window. 6.
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