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What is the heat transferred to the system if the enthalpy of the output is 10 J and input is 6 J?

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What is the heat transferred to the system if the enthalpy of the output is 10 J and input is 6 J?

(a) 4 J

(b) 5 J

(c) 6 J

(d) 8 J

I have been asked this question in my homework.

My question is based upon Merging Heat of Formation with Sensible Heat of Compound in chapter 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 answer is (a) 4 J

Easy explanation: Q = ∆Hout – ∆Hin = 10 – 6 = 4 J.

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