The chlorofluorocarbon CCl2F2 (Freon; MW=120.91 g/mol) was once used as a refrigerant. Cooling comes from the evaporation of the refrigerant. Calculate the mass of CCl2F2 that must evaporate in order to freeze 15.00 g of water initially at +20.0°C. The heat of vaporization, Hvap, of CCl2F2 is 34.94kJ/mol. (Hint: It will be helpful to remember the first law of thermodynamics – Energy is conserved.)

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