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A reaction has produced 5 moles of water vapor and 10 liter bone dry air at 27^oC and 15 atm, what is the humidity?

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A reaction has produced 5 moles of water vapor and 10 liter bone dry air at 27^oC and 15 atm, what is the humidity?

(a) 24%

(b) 49%

(c) 83%

(d) 106%

The question was asked in an online quiz.

Asked question is from Material Balance Problems Involving Partial Saturation in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

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Right answer is (c) 83%

For explanation I would say: Moles of bone dry air = 6, => humidity = 5/6*100 = 83%.

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