Assume the validity of the De Priester charts, make the following VLE calculations for ethane  (1)/ propane (2)/ isobutene (3)/ isopentane (4) systems:  BUBL P, given x1 = 0.27, x2 = 0.33, x3 = 0.15 and t = 650C (b) DEW P, given y1 = 0.46, y2 = 0.18, y3 = 0.12 and t = 600C

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