Heat of Fusion & Heat of vaporization

• n = m/M

  • n = number of mols (mol)
  • m = mass (g)
  • M = Molar mass (g/mol)
• Heat of fusion of a substance is the amount of energy absorbed when 1 mol of the substance changes from solid - liquid without change in temperature

  • Q = nHfus
  • Q = quantity of thermal energy (KJ)
  • n = number of moles (mol)
  • Hfus = Heat of fusion (KJ/mol)
• Heat of vaporization of a substance is the amount of energy absorbed when 1 mol of the substance changes from liquid - gas without change in temperature

  • Q = nHvap
  • Q = quantity of thermal energy (KJ)
  • n = number of moles (mol)
  • Hvap = heat of vaporization (KJ/mol)