What amount of heat (in kJ ) is required to convert 13.4g of an unknown solid (MM=67.44g/mol) at 15.4C to a liquid at 42.7C? (specific heat capacity of solid =1.95J/gC; specific heat capacity of liquid =1.18J/gC;H fus =5.72kJ/mol; normal freezing point, Tf= 28.3C )