Question

General mole balance equation of species ‘i’ at any instant is as follows: ________

(a) Rate of moles of ‘i’ in = Rate of moles of ‘i’ out

(b) Rate of moles of ‘i’ in + Rate of moles of ‘i’ out = Rate of moles of ‘i’ accumulated

(c) Rate of moles of ‘i’ in + Rate of moles of ‘i’ accumulated = Rate of moles ‘i’ out

(d) Rate of moles of ‘i’ in – Rate of moles of ‘i’ consumed by reaction – Rate of moles of ‘i’ out = Rate of moles of ‘i’ accumulated

This question was posed to me in homework.

The doubt is from Mole Balances topic in division Basic Concepts of Chemical Reaction Engineering

Answer 1

Correct option is (d) Rate of moles of ‘i’ in – Rate of moles of ‘i’ consumed by reaction – Rate of moles of ‘i’ out = Rate of moles of ‘i’ accumulated

To elaborate: Governed by principles of conservation of mass and energy the following equation is the basic equation in Chemical engineering for design of all process units.

IN – OUT + Generation – Consumption = Accumulation.