Question

How much heat (in kilojoules) must be applied to melt a 944.4 g sample of gold given that the melting point is 1064.18ºC and the enthapy of fusion is 12.55 kJ/mol?

Answer: 60.17 kJ

Answer 1

mass of gold = 944.4 g

molar mass of gold = 197 g / mol

moles of gold = mass / molar mass

                      = 944.4 / 197

                     = 4.794

enthapy of fusion = 12.55 kJ/mol

heat = enthapy of fusion x moles

         = 12.55 kJ/mol x 4.794 mol

      = 60.17 kJ

heat must be applied = 60.17 kJ