1.superheated water vapour at 1.4MPa &250degree C is allowed 2 cool at const vol.until the temp. drops to 150 degree C.at the final state determine

1.the pressure

2.quality

3.enthalpy

2.a piston cylinder device contains 0.8kg of steam at 300 degree C &1MPa.steam is cooled at const pressure until one half of the mass condenses.

1.find the final temp.

2.determine the vol. change 

someone plz ans na,its urgent!!!