Liquid ammonia, NH3 (l), was once used in home refrigerators as the heat transfer fluid. The specific heat capacity of the liquid is 4.7 J/g•Kand that of the vapor is 2.2 J/g•K. The enthalpy of vaporization is 23.33 kJ/mol the boiling point. If you heat 12 kg of liquid ammonia from –50°C to its boiling point of –33.3°C, allow it to evaporate, and then continue warming to 0.0°C, how much energy must you supply?

Question

Liquid ammonia, NH3 (l), was once used in home refrigerators as the heat transfer fluid.  The specific heat capacity of the liquid is 4.7 J/g•Kand that of the vapor is 2.2 J/g•K.  The enthalpy of vaporization is 23.33 kJ/mol the boiling point.  If you heat 12 kg of liquid ammonia from –50°C to its boiling point of –33.3°C, allow it to evaporate, and then continue warming to 0.0°C, how much energy must you supply?

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