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What is the humid volume of the system at 200oF with humidity 40%?

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What is the humid volume of the system at 200oF with humidity 40%?

(a) 14.2 ft3/lb

(b) 23.4 ft3/lb

(c) 29.5 ft3/lb

(d) 31.6 ft3/lb

This question was addressed to me in exam.

The origin of the question is Humidity (Psychrometric) Chart in chapter Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

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The correct answer is (d) 31.6 ft3/lb

Explanation: V = (0.73*200 + 336)(1/29 + 0.4/18) = 31.6 ft3/lb.

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