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What is the enthalpy of the reaction from 10^oC to 15^oC if CP = 5 J/^oC, and the reference enthalpy is 25 J?

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What is the enthalpy of the reaction from 10^oC to 15^oC if CP = 5 J/^oC, and the reference enthalpy is 25 J?

(a) 25 J

(b) 50 J

(c) 75 J

(d) 100 J

I had been asked this question by my school principal while I was bunking the class.

My question is taken from 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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Right option is (b) 50 J

The best I can explain: Enthalpy of reaction = 25 + 10∫^155.dT = 25 + 5*5 = 50 J.

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