A piston cylinder device, whose piston is resting on a set of stops, initially

contains $5$kg of liquid$-$vapor mixture at $100$C with x$=20\%.$The mass of the piston is such

that a pressure of $400$kPa is required to move it$.$Heat is now added until the water reaches the saturated vapor state. Show the proses on a P$-$v diagram.

a$)$the initial volume of mixture in m$^3,$b$)$the final temperature of the saturated vapor,

c$)$the work done for the overall process, d$)$the heat is transfer red during this process.