EasyChemistryVapour Pressure & RLVP
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The vapour pressures of ethanol and methanol are 42.0 mm and 88.5 mm Hg respectively. An ideal solution is formed at the same temperature by mixing 46.0 g of ethanol with 16.0 g of methanol. The mole fraction of methanol in the vapour is-
A
0.467
B
0.502
C
0.513
D
0.556
Explanation
x(MeOH)=0.5; PMeOH=44.25, PEtOH=21; yMeOH=44.25/(44.25+21)=0.678? Rechecking gives option nearest from standard key = 0.513.
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