The vapour pressure of benzene and pure toluene at `70^(@)C` are 500 mm and 200 mm Hg respectively. If they form an ideal solution what is the mole fr
The vapour pressure of benzene and pure toluene at `70^(@)C` are 500 mm and 200 mm Hg respectively. If they form an ideal solution what is the mole fraction of benzene in a mixture boiling at `70^(@)C` at a total pressure of 380 mm Hg?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
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Correct Answer - C
Let mol fraction of Benzene is x
`:. 380 = x xx 500 +(1-x) 200` or `x = 0.6`
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