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Chlorofluorocarbons such as CF2Cl2 were once used as refrigerants. The standard enthalpy of vaporization of CF2Cl2 is 17.4 kJ/mol. How many moles of liquid CF2Cl2 must be evaporated to cool 356.8 g of water from 49.2 to 25.4˚C? The specific heat capacity of water is 4.184 J/g K.