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A stream of saturated water at 54 o C at 25 lbm/min and ammonia solution (50 wt%) at 150 lbm/min are fed to a boiler at 1 atm. The enthalpy of the ammonia solution relative to the reference conditions is 125 BTU/lbm. The liquid and vapor products are leaving the system. The liquid composition is to be 13 wt% NH3. Determine the rate at which heat must be transferred to the system. Includes diagram, mass balance, energy balance.