A piston$-$cylinder device initially contains $1\mathrm{.}0$ kg of water at $30$ oC and $2$ MPa. The water is heated at constant pressure until one$-$quarter of the mass evaporated. Determine:$$a$)$ the initial volume of the system. $$b$)$ the final volume and temperature after heating $.$c$)$ the amount of heat added during the process $($in kJ$).$d$)$ Show the process on T$-$v diagram.