A two-phase system made up of liquid water in equilibrium with its vapor at 12000 kPa contains 70% of the total volume of 1 m^3 vapor. Calculate the liquid mass contained in the tank.

Use thermodynamics vapor table to solve the problem above.

These are the possible answers, choose the correct one:

a. 18.56 kg

b. 19.65 kg

c. 29.33 kg

d. 20.3 kg