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The feed of a process simulator is 15 J, the heat input is 8 J, and the work performed is 10 J, what will be the product enthalpy?

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The feed of a process simulator is 15 J, the heat input is 8 J, and the work performed is 10 J, what will be the product enthalpy?

(a) -3 J

(b) 13 J

(c) 15 J

(d) 17 J

This question was posed to me at a job interview.

The query is from Unsteady-State Material and Energy Balances in chapter 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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Correct choice is (b) 13 J

Easy explanation: Energy balance, H = 15 + 8 – 10 = 13 J.

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