A tank of volume 0.05 m3 contains a mixture of saturated water and saturated steam at

Q. A tank of volume 0.05 m³ contains a mixture of saturated water and saturated steam at 200°C. The mass of the liquid present is 8 kg.  The entropy (in kJ/kg K) of the mixture is (correct to two decimal places).

Property data for saturated steam and water are:

At 200°C, psat = 1.5538 MPa

v f = 0.001157 m³/kg, vg = 0.12736 m³/kg

sfg   = 4.1014 kJ/kg K, sf= 2.3309 kJ/kg K

Ans: 2.45 – 2.55