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What is the molal humidity of a gas with pressure of gas vapor 10 mm Hg and pressure of vapor free gas 20 mm Hg?

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What is the molal humidity of a gas with pressure of gas vapor 10 mm Hg and pressure of vapor free gas 20 mm Hg?

(a) 25%

(b) 50%

(c) 100%

(d) 200%

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This interesting question is from Partial Saturation Terminology topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

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The correct choice is (b) 50%

Explanation: Molal humidity = 10/20*100 = 50%.

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