A well$-$insulated rigid tank contains $3kg$ of a saturated liquidvapor mixture of water at $200$kPa. Initially, three$-$quarters of the mass is in the liquid phase. An electric resistance heater placed in the tank is now turned on and kept on until all the liquid in the tank is vaporized. Determine the entropy change of the steam during this process. ANSWER: $11\mathrm{.}1k\frac{J}{K}$

Mass of saturated liquid$-$Vapor $m=3kg$ Pressure of Water $P=200$KPa

Mass of liquid water $m_1=\frac{3}{4}m$

Mass of vapor mix ture $m_v=\frac{1}{4}m$

Table $A-5$

$]=\frac{3}{4}3Kg=2\mathrm{.}25kg=3Kg-2\mathrm{.}25Kg[0\mathrm{.}75kg$

Can you show the work on how to find S$2?$