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Question

Before the introduction of chlorofluorocarbons, sulfur dioxide (enthalpy of vaporization, 5.96 kcal/mol) was used in household refrigerators. What mass (in kg) of SO2 must be evaporated to remove as much heat as evaporation of 1.87 kg of CCI2F2 (enthalpy of vaporization is 20.1 16/mol)?