GATE Chemical - GATE 2017-2018 Questions and Answers

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The vapor-liquid equilibrium curve of a binary mixture A-B, may be approximated by a linear equation over a narrow range of liquid mole fractions ( 0.2 < x_A < 0.3) as follows

y^*_A = 1.325 x_A + 0.121

Here y^*_A is the mole fraction of A in the vapor. 100 moles of a feed (x_{A, F} = 0.28) is batch distilled to a final residue (x_{A, W} = 0.2). Using the Rayleigh equation, the number of moles of the residue left behind in the distillation unit, up to 2 digits after the decimal point, is ____________

45 to 46

55 to 56

66 to 67

85 to 86

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