What quantity of energy does it take to convert 0.562 kg ice at −20.0°C to steam at 250.0°C? Specific heat capacities: ice, 2.03 J/g·°C; liquid, 4.18 J/g·°C; steam, 2.02 J/g·°C; ΔHvap = 40.7 kJ/mol; ΔHfus = 6.02 kJ/mol.