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What is the humid volume of the system at 300oF with humidity 30%?

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What is the humid volume of the system at 300oF with humidity 30%?

(a) 15.5 ft3/lb

(b) 28.4 ft3/lb

(c) 39.8 ft3/lb

(d) 55.2 ft3/lb

The question was asked in class test.

This key question is from Humidity (Psychrometric) Chart topic in division 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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Right answer is (b) 28.4 ft3/lb

Easy explanation: V = (0.73*300 + 336)(1/29 + 0.3/18) = 28.4 ft3/lb.

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