Ammonia in a piston-cylinder assembly undergoes two processes in series. Initially, the ammonia is saturated vapour at P₁=1000 kPa. Process 1-2 involves cooling until the piston meets the stops where the position is locked in place at which time quality is x2=75%. The second process from state 2 to state 3, involves heating (at constant volume) until x3=100%. If the mass is 0.45 kg determine: The heat transfer for process 2-3 (in kJ). Sketch the processes on a p-v diagram, what does the area under the curve represent?

2 Kg/s of a solid containing 30% by mass a water soluble component is to be leached in a counter – current unit. Given that the recovery is 98% and that the under flow from each stage contains 0.5 Kg water / Kg insoluble solid. Find the number of stages required if the water flow rate is 1.6 Kg/s

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