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What is the humid heat of a mixture of air (CP = 20 J) with water vapor (CP = 30 J), if the humidity is 40%?

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What is the humid heat of a mixture of air (CP = 20 J) with water vapor (CP = 30 J), if the humidity is 40%?

(a) 24 J

(b) 32 J

(c) 38 J

(d) 44 J

The question was posed to me by my school principal while I was bunking the class.

I want to ask this question 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 choice is (b) 32 J

Easiest explanation: CS = 20 + 30*0.4 = 32 J.

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