Calculate the enthalpy of vaporization in kJ/mol of a refrigerant at 20.0 \deg C given that its pressure is 504.6 torr at 16.0 \deg C and 646.2 torr at 24.0 \deg C.
To calculate the answer, we need to know:
the Two-Point Clausius-Clapeyron Equation is
the gas constant is 8.314 J / mol·K
Kelvin temperature = 273.15 + Celsius temperature
the boiling temperature is reached when the vapor pressure equals the atmospheric pressure, which is 760 torr at sea level