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Vapor-Liquid Equilibrium
GATE 2016
Medium
A binary benzene-toluene mixture has 20 mol% benzene. At 350K, Psat,benzene=92kPa, Psat,toluene=35kPa (Raoult's law applies). The equilibrium vapor phase mole fraction of benzene, rounded to 2 decimal places, is
0.4(± 0.01 accepted)
Explanation
P=0.2×92+0.8×35=18.4+28=46.4kPa. y_benzene=18.4/46.4=0.397.
Source: GATE CH 2016 (2016)
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