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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 60%?

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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 60%?

(a) 10 J

(b) 14 J

(c) 19 J

(d) 23 J

The question was posed to me in a job interview.

This question is from Humidity (Psychrometric) Chart 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 (c) 19 J

To explain: CS = 10 + 15*0.6 = 19 J.

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