1. The problem statement, all variables and given/known data Wet steam at 0.5Mpa, quality 0.84 is to be heated to dry saturated steam. Determine the heat required if it is heated at constant volume and at constant pressure. 2. Relevant equations h=hf +xhfg u=uf +xufg s=sf +xsfg v=vf +xvfg 3. The attempt at a solution WET STEAM Sat. pressure 500.0000 kPa Sat. temperature 151.8438 C Quality 0.8400 Moisture 0.1600 Enthalpy 2410.3480 kJ/kg hf 640.1158 kJ/kg hfg 2107.4194 kJ/kg hg 2747.5351 kJ/kg Internal energy 2252.8966 kJ/kg uf 639.5693 kJ/kg ufg 1920.6277 kJ/kg ug 2560.1970 kJ/kg Entropy 6.0258 kJ/kg/C sf 1.8604 kJ/kg/C sfg 4.9588 kJ/kg/C sg 6.8192 kJ/kg/C Specific volume 0.3149 m3/kg vf 0.0011 m3/kg vfg 0.3736 m3/kg vg 0.3747 m3/kg this is what I found so far from the tables At constant volume: (W=0) 1st law: Q-W=U therefore Q=U=m(u2-u1) I can get the specific entropies, internal energies, volumes,enthalpies from the tables. But how do I get the mass?