How much heat is needed to convert 2.00 kg of liquid ammonia at -40.0 oC to its vapor at -11.0 oC? The specific heat of liquid ammonia, NH3 (l), is 4.70 J/g-K and that of the vapor NH3 (g), is 2.20 J/g-K. The enthalpy of vaporization of ammonia is 23.3 kJ/mol and its boiling point is -33.3 oC. Please help!!

Question

How much heat is needed to convert 2.00 kg of liquid ammonia at -40.0 oC to its vapor at -11.0 oC?  The specific heat of liquid ammonia, NH3 (l), is 4.70 J/g-K and that of the vapor NH3 (g),  is 2.20 J/g-K.  The enthalpy of vaporization of ammonia is 23.3 kJ/mol and its boiling point is -33.3 oC.  Please help!!

bobpursley · Answer

Add the following: Heat to go from -40C to -33C Heat to vaporize at -33C Heat to go from -33 to-11C as a vapor.