Calculate the enthalpy change (in term of kJ) upon converting 72 grams of ice at −30 OC to water vapor (steam) at 150 OC under a constant pressure at 1 atm . the specific heats of ice , water and steam are 2.09 J g−1 K−1 , 4.18 J g−1 K−1 and 1.84 J g−1 K−1 , respectively. For water : ΔHfus = 6.01 kJ mol−1 and ΔHvap = 40.67 kJ mol−1