Hi, here is a problem which I've started to solve:

A cylinder fitted with a piston has a volume of 0.1 m3 and contains 0.5 kg of steam at 0.4

MPa. Heat is transferred to the steam until the temperature is 300 °C, while the pressure

remains constant. Determine the heat transfer and work done for this process. Neglect the

change in kinetic and potential energies.

I have found x1 by solving for specific volume and using steam tables for hf and hfg. x1 = 0.4311

Now I used initial conditions to find h1; = 1524.6kJ/kg

How do I find h2? I use the same formula - h2 = x2.hg + (1-x2).hf

but not sure which x2 value to use or which hf & hg values?

Thanks

You should find that if the steam is in superheated region now. If it is in superheated region then dryness fraction has no meaning in superheated region. You can use superheated steam tables in that case.