Question

The vapor pressure of dichloromethane, CH_2Cl_2, at 0 degrees celcius is 134 mmHg. The normal boiling point of dichloromethane is 40 degrees celcius.

Calculate its molar heat of vaporization (in kJ/mol).
Use the Clausius-Clapeyron equation. You have the one pressure point with temperature, the other one you may use the boiling point where the vapor pressure will be 760 torr. Note the correct spelling of celsius.
30.691 Kjule/mole

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