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Question
An ideal solution was obtained by mixing methanol and ethanol. If the partial vapour pressures of methanol and ethanol are 2.8 and 4.2 kPa respectively, the mole fraction of methanol in the vapour at equilibrium is
Options
A.0.67
B.0.4
C.0.6
D.0.33
Solution
$Y_{\text{methanol}} = \frac{P_{\text{methanol}}}{P_{\text{total}}} = \frac{2.8}{2.8 + 4.2} = 0.4$
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