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Assume an ideal solution with pure component A, has a vapour pressure of 300 mmHg and the total pressure of 1atm. The concentration in terms of mole ratio is

(a) 0.65

(b) 0.28

(c) 0.39

(d) None of the mentioned

This question was addressed to me in examination.

This interesting question is from Material Balance Concepts-Cocurrent in portion Interphase Mass Transfer of Mass Transfer

1 Answer

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by (39.8k points)
The correct answer is (a) 0.65

Explanation: According to Rauolt’s law, for an ideal solution

Total pressure= concentration x vapour pressure

Concentration in mole fraction=300/760 =0.39

Concentration in mole ratio = 0.39/(1-0.39)=0.65.

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