KVPY SX SB Exam 05-Nov-2017 Question Paper

Question : 109 of 120

Marks: +1, -0

A mixture of toluene and benzene boils at 100°C. Assuming ideal behaviour, the mole fraction of toluene in the mixture is closest to [Vapour pressures of pure toluene and pure benzene at 100°C are 0.742 and 1.800 bar respectively. 1 atm = 1.013 bar]

0.824
0.744
0.544
0.624

Validate

Solution:

1.013 = 0.742 X_t + 1.8 X_b

1.013 = 0.742(1 -X_b) + 1.8 X_b

X_b = 0.256

∴

X_t = 1 - X_b = 0.744

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