What amount of heat (in kJ ) is required to convert 26.3g 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;Hfus=5.72kJ/mol; normal freezing point, Tf= 28.3C)