what is kj mole
Every substance has its own molar heat of vaporization. The units for the molar heat of vaporization are kilojoules per mole (kJ/mol). Sometimes the unit J/g is used. In that case, it is referred to as the heat of vaporization, the term 'molar' being eliminated. The molar heat of vaporization for water is 40.7 kJ/mol.