Really quick question about finding specific volume in thermodynamics

[rock.freak667]

Here is the situation, I have a Mollier Diagram(pressure-enthalpy diagram) for refrigerant R134. I had to draw a refrigeration cycle on the that find the specific volumes and enthalpies for each point. I read off the enthalpies at all 4 state points. Found the specific volumes for states 1 and 2 as they are in the superheated region where the specific volume lines contours are. But I don't know how to find the volumes at states 3 and 4.


I see state 3 lies on the saturated vapor line, so I think I should just use that specific volume as h_f at the pressure.

State 4 lies at a point of known pressure and on a line where the quality(x) can be seen. To find v₄, do I just use v₄=v_f+xv_fg, or can this be somehow read off this diagram?

 

[Feldoh]

v4=vf+xvfg is fine for the specific volume of state 4.

 

[rock.freak667]

thanks then!