Thermo Question on isothermal expansion

[danield]

Homework Statement

I have a mixture of saturared water liquid vapor mixture at 200 c, volume = .03 m^3 at 15.54 Bars... the mixture undergoes an isothermal expansion and the volume doubles, what is the new pressure?

mtotal = .301 kg

Homework Equations

this is my prob not sure which equation to use

The Attempt at a Solution

I am not sure which equation to use, and none of the tries i have made have worked... i assumed it as a linear equation and it didnt work...

 

[djeitnstine]

Do you have tables of thermodynamic properties of fluids at different temperatures and pressures?

If so you can calculate the specific volume and use that to easily find the new pressure.