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What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 25 J), if the humidity is 20%?

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What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 25 J), if the humidity is 20%?

(a) 15 J

(b) 20 J

(c) 25 J

(d) 30 J

The question was posed to me in quiz.

My enquiry is from Humidity (Psychrometric) Chart 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
The correct option is (a) 15 J

Explanation: CS = 10 + 25*0.2 = 15 J.

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