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A container has vapor H2O with partial pressure 9 atm, what is fraction of air in the vessel?

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A container has vapor H2O with partial pressure 9 atm, what is fraction of air in the vessel?

(a) 0.1

(b) 0.4

(c) 0.7

(d) 0.9

I got this question in a national level competition.

This intriguing question originated from Saturation topic in portion Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering

1 Answer

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The correct option is (a) 0.1

Easiest explanation: Pressure of air = 1 atm, => fraction of air = 1/(1 + 9) = 0.1.

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