Project ForgeProcess Calculations
Vapor-Liquid Equilibrium
GATE 2016
Hard
A binary system follows the two-suffix Margules equation, gE/RT=3x1x2. At temperature T, g1/RT=1, g2/RT=2 (pure species). For a mixture with 40 mol% species 1, the value of g/RT, rounded to 2 decimal places, is
1.65(± 0.03 accepted)
Explanation
g/RT=x1(g1/RT)+x2(g2/RT)+Σxᵢln(xᵢ)+gE/RT=0.4(1)+0.6(2)+[0.4ln0.4+0.6ln0.6]+3(0.4)(0.6)=1.6−0.673+0.72=1.65.
Source: GATE CH 2016 (2016)
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