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Consider a saturated gas(A.-vapour(B. mixture , if the absolute molal humidity is 0.265 and the total pressure= 760 mmHg. Find the vapour pressure of B.

(a) 149.21 mmHg

(b) 159.21 mmHg

(c) 169.21 mmHg

(d) 600.8 mmHg

I had been asked this question in unit test.

This is a very interesting question from Humidification-Vapour-Gas Mixture topic in portion Humidification Operations of Mass Transfer

1 Answer

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by (39.8k points)
The correct choice is (d) 600.8 mmHg

The best I can explain: First, we have to find the vapour pressure of A.

 0.265= pA/760-pA

pA= 159.21

pB=760-159.21= 600.8.

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