Two flash vessels are hooked together in series such that the liquid stream exiting the first vessel is fed into the second vessel. Both vessels are operated at 1 atm. The feed to the first vessel is a binary mixture of methanol and water with a flow rate of 10,000 kg-mol hr and a methanol mole fraction of 0.55. The second flash vessel operates with V2/F2 = 0.7 and an outlet liquid phase methanol mole fraction (X42) of 0.25. The following equilibrium data is available: Temp (deg C) 100.0 96.4 93.5 91.2 89.3 87.7 84.4 81.7 78.0 75.3 73.1 71.2 69.3 67.6 66.0 65.0 64.5 0 2 4 6 8 10 15 20 30 VA 0.0 13.4 23.0 30.4 36.5 41.8 51.7 57.9 66.5 72.7 77.9 82.5 87.0 91.5 95.8 97.9 100.0 40 50 60 70 80 90 95 100 What fraction of the feed is vaporized in the first flash vessel