Question

Two feeds, F1 with H = 10 J/mole and F2 with H = 25 J/mole, and product 15 moles with H = 15 J/mole, what is the F2?

(a) 5 mole

(b) 10 mole

(c) 15 mole

(d) 20 mole

This question was posed to me in final exam.

I'd like to ask this question from Solving Energy Balance Problems topic 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

Answer 1

The correct choice is (a) 5 mole

The explanation is: Energy balance: 10*F1 + 25*F2 = 15*15, => F1 + F2 = 15, => F2 = 5 mole.