An ice cube tray contains enough water at 22.0oC to make 18 ice cubes, each of which has a mass of 30.0 g. The tray is placed in a freezer that uses CF2Cl2 as a refrigerant. The heat of vaporization of CF2Cl2 is 158 J/g. What mass of CF2Cl2 must be vaporized in the refrigeration cycle to convert all the water at 22.0oC to ice at 25.0oC? The heat capacities for H2O(s) and H2O(l) are 2.08 Jg-1oC-1 and 4.18 Jg-1oC-1, respectively, and the enthalpy of fusion for ice is 6.01 kJ/ mol.