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For an open unsteady state system, 5 J of heat was supplied and 10 J of work was done on the system, what is the value of a change in enthalpy?

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For an open unsteady state system, 5 J of heat was supplied and 10 J of work was done on the system, what is the value of a change in enthalpy?

(a) 5 J

(b) 10 J

(c) 15 J

(d) 20 J

I have been asked this question in my homework.

My doubt stems from Vaporization and Energy Balances for Open, Unsteady-State Systems topic in chapter Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

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Best answer
Correct choice is (c) 15 J

The explanation: ∆H = 5 + 10 = 15 J.

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