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Two feeds, F1 with H = 10 J/mole and F2 with H = 20 J/mole, and product 10 moles with H = 15 J/mole, what is the F1?

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Two feeds, F1 with H = 10 J/mole and F2 with H = 20 J/mole, and product 10 moles with H = 15 J/mole, what is the F1?

(a) 5 mole

(b) 10 mole

(c) 15 mole

(d) 20 mole

I have been asked this question in homework.

My question is taken from Solving Energy Balance Problems in section 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
The correct option is (a) 5 mole

The best explanation: Energy balance: 10*F1 + 20*F2 = 10*15, => F1 + F2 = 10, => F1 = 5 mole.

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