Problem $07\mathrm{.}047-$Entropy change in a rigid tank.

A $0\mathrm{.}700-m^3$ rigid tank contains refrigerant$-134$a initially at $200$ kPa and $40$ percent quality. Heat is transferred now to the refrigerant from a source at $35C$ until the pressure rises to $400$ kPa $.$

Problem $07\mathrm{.}047.$a $-$ Entropy change of R$134$a heated in a rigid tank

Determine the entropy change of the refrigerant. Use the tables for R$-134$a$.$

The entropy change of the refrigerant is $q,k\frac{J}{K}.,$

The entropy change of the heat source is kJ$/$K