The kilocalorie per mole is a derived unit of energy per Avogadro's number of particles. It is the quotient of a kilocalorie (1000 thermochemical gram calories) and a mole, mainly used in the United States. In SI units, it is equal to \(4.184 kJ/mol\), or \(6.9477 \times 10 J per molecule\). At room temperature it is equal to 1.688 . Physical quantities measured in \(kcal\cdot mol\) are usually thermodynamical quantities; mostly free energies such as: Heat of vaporization Heat of fusion.