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Benzene and toluene form an ideal soluti...

Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at T(K) are 50mm Hg and 40 mm Hg respectively. What is the mole fraction of toluene in vapour phase when 117 g of benzene is mixed with 46g of toluene? (molar mass of benzene and toluene are 78 and `92 g mol^(-1)` respectively).

A

0.78

B

0.21

C

0.64

D

0.35

Text Solution

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The correct Answer is:
B
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