Saturated liquid refrigerant R-134a is throttled from 750 to 80 kPa.

(a) What is the entropy of the refrigerant before the throttling process?

$\displaystyle \frac{\text{kJ}}{\text{kg K}}$

(b) What is the entropy of the refrigerant after the throttling process?

$\displaystyle \frac{\text{kJ}}{\text{kg K}}$