What is he enthalpy change ( in term of MJ) during the process in which 200.0 g of water at 80.00 OC is cooled to ice at −30.00 OC (use the specific heats and enthalpies for phase changes given in exercise number 3)
5. Freon -12, CCl2F2, is used as refrigerant. It’s heat of vaporization is 289J/g . What mass of
Freon-12 must evaporate in order to freeze 500 g of water initially at 20 OC (The heat of fusion