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What are moles of dry gas if the moles of water vapor is 14 at 25% humidity?

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What are moles of dry gas if the moles of water vapor is 14 at 25% humidity?

(a) 3.5

(b) 7

(c) 14

(d) 56

This question was posed to me during an interview.

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

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Best answer
Right choice is (d) 56

The explanation is: Moles of dry gas = 14/0.25 = 56.

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