GATE 2021 ME (ME2) – Question 32

A rigid tank of volume 50 m³ contains a pure substance as a saturated liquid vapour mixture at 400 kPa. Of the total mass of the mixture, 20% mass is liquid and 80% mass is vapour. Properties at 400 kPa are: $T_{sat}=143.61$°C, $v_f=0.001084$ m³/kg, $v_g=0.46242$ m³/kg. The total mass of liquid vapour mixture in the tank is _____ kg (round off to the nearest integer).