Question

1976 when the molecular weight of a volatile liquid is calculated from the weight, volume, temperature, and pressure of a sample of that liquid when vaporized, the assumption is usually made that the gas behaves ideally. in fact at a temperature not far above the boiling point of the liquid, the gas is not ideal. explain how this would affect the results of the molecular weight determination

Answer 1

This would affect the results of the molecular weight determination as this would lead to a higher value for the molecular weight than the true value. The useful relationship is M= (gRT)/(PV). Significant intermolecular attraction exists at temperatures not far above boiling point. Therefore, the compressibility of the gas is greater and the value of the PV is smaller than predicted.

The molecular weight (MW) is the total atomic weight of a molecule. The MW is determined by summing the mass of all the individual atoms in a molecule.

If a substance is a volatile liquid, a common method to determine its molar mass is to use the ideal gas law, PV= nRT. Because the liquid is volatile, it can easily be converted to a gas. While the substance is in the gas phase, you can measure its volume, pressure, and temperature.

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