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What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 15 J), if the humidity is 40%?

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What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 15 J), if the humidity is 40%?

(a) 16 J

(b) 20 J

(c) 24 J

(d) 32 J

The question was asked by my college director while I was bunking the class.

Question is from Humidity (Psychrometric) Chart topic in portion 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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Best answer
Right answer is (a) 16 J

The best explanation: CS = 10 + 15*0.4 = 16 J.

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