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Two feeds, 15 moles with H = 10 J/mole and 10 with H = 20 J/mole, what is the enthalpy of products?

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Two feeds, 15 moles with H = 10 J/mole and 10 with H = 20 J/mole, what is the enthalpy of products?

(a) 8 J/mole

(b) 12 J/mole

(c) 18 J/mole

(d) 25 J/mole

This question was posed to me in an interview.

Query is from Solving Energy Balance Problems topic 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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Right answer is (c) 18 J/mole

Easy explanation: 25*H = 15*10 + 10*20, => H = 18 J/mole.

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