HELP!!!A question on vapour pressure 1. The problem statement, all variables and given/known data The vapor pressure of dichloromethane, CH2Cl2, at 0 degree Celsius is 134 mmHg. The normal boiling point of dichloromethane is 40.0 degree Celsius. Calculate its molar heat of vaporization. 2. Relevant equations 3. The attempt at a solution ln(P_2/134)=(Change of H_vapour/8.314)(1/(0+273)-1/(40+273)) I still have two unknown variables...I should find change H_vapour for this question, but I don't know how to figure out P_2 Thank you for helping me.