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Three feeds, 10 mole with H = 25 J/mole, 5 mole with H = 10 J/mole and 15 mole with 20 J/mole, what is the enthalpy of the products?

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Three feeds, 10 mole with H = 25 J/mole, 5 mole with H = 10 J/mole and 15 mole with 20 J/mole, what is the enthalpy of the products?

(a) 10 J/mole

(b) 12 J/mole

(c) 20 J/mole

(d) 28 J/mole

I got this question in class test.

My question is taken from Solving Energy Balance Problems in portion 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) 20 J/mole

The best I can explain: 30*H = 10*25 + 5*10 + 15*20, => H = 20 J/mole.

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