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What is the heat transferred to the system if the enthalpy of the output is 15 J and input is 10 J?

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What is the heat transferred to the system if the enthalpy of the output is 15 J and input is 10 J?

(a) 1 J

(b) 2 J

(c) 4 J

(d) 5 J

I got this question in examination.

My enquiry is from Merging Heat of Formation with Sensible Heat of Compound topic 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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Best answer
Correct answer is (d) 5 J

For explanation I would say: Q = 15 – 10 = 5 J.

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