When a student plotted ln [vapor pressure of a gas] vs. inverse Kelvin temperature, she obtained a straight line with a slope equal to -9.500 x 10^3 K.

According to the Clausius Clapeyron equation, Hvap is kJ/mol.

1 answer

http://www.science.uwaterloo.ca/~cchieh/cact/c123/clausius.html