Mass flow equal to $0\mathrm{.}5$ kg$/$s of water flows through a heat exchanger. It heats saturated liquid R$-134$a from T $=-30$C to a saturated vapor at T $=-20$C at a mass flow rate of $0\mathrm{.}25$ kg$/$s$.$ The water enters the heat exchanger at P $=300$ kPa and T $=150$ C$.$ It exits at $75$ kPa.$$ Using the property tables for R$-134$a and water, what is the enthalpy of the water at the exit?

For the heat exchanger in Question $2$a$,$ what is the exit temperature of the water?$$ Use the property tables for water.