54. A tank contains exactly one kilogram of water consisting of liquid and vapor in equilibrium

at 1 MPa. If the liquid contains one-third and the remaining is vapor of the volume of the tank,

what is the enthalpy of the contents of the tank?

@ 1MPa: υf = 0.0011273 m3

/kg υfg = 0.19444 m3

/kg

hf = 762.81 kJ/kg hfg = 2015.3 kJ/kg

A. 644.40 kJ/kg

B. 774.40 kJ/kg

C. 785.92 kJ/kg

D. 435.29 kJ/kg