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What is the heat transferred from the system if the enthalpy of the output is 25 J and input is 10 J?

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What is the heat transferred from the system if the enthalpy of the output is 25 J and input is 10 J?

(a) 5 J

(b) -5 J

(c) 15 J

(d) -15 J

I have been asked this question in an interview.

My question is based upon Merging Heat of Formation with Sensible Heat of Compound in division Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances: How to Account for Chemical Reaction of Basic Chemical Engineering

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The correct option is (d) -15 J

Easy explanation: Heat transferred from the system = 10 – 25 = -15 J.

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