At -10°C explain how much heat is required to convert 870. g of ice to steam at the 137°C? The specific heats of steam, ice and the liquid are 1.99 J/g·°C, 2.03 J/g·°C and 4.18J/g·°C, respectively. Where the heat of vaporization is 40.79 kJ/mol and heat of fusion is 6.02 kJ/mol.