QUESTION $4$

$\frac{?}{{?}_{297}},0$

V$25$a$,$

DU

$[22]$

A piston$-$cylinder device contains $0\mathrm{.}4-kg$ of saturated water liquid$/$vapour mixture at $200-$kPa at quality of $0\mathrm{.}7.$ At this state, the piston is resting on a set of stops, and the mass of the piston is such tha a pressure of $300-$kPa is required to move it$.$ Heat is now slowly added to the system until the volum doubles. Sketch the process on a P$-$v diagram with respect to the saturation lines, and determine:

$4\mathrm{.}1$ The initial temperature.

DONE

$4\mathrm{.}2$ The initial volume occupied by the mixture.

$(4)$

$4\mathrm{.}3$ The state $($phase descriptim$)$ of the water at the point where the piston starts to move.

$(2)$

$4\mathrm{.}4$ The temperature of the water at the end of the entire process.

$(3)$

$4\mathrm{.}5$ The total change in internal energy of the water for the entire process.

$(5)$

$4\mathrm{.}6$ The total work done by the device during the entire process. Indicate whether the work is done by the system or on the system.

$(3)$

$4\mathrm{.}7$ The total heat added to the water during the entire process.