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’ accumulatedThis question was posed to me in homework.The doubt is from Mole Balances topic in division Basic Concepts of Chemical Reaction Engineering

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

1.	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’ accumulatedThis question was posed to me in homework.The doubt is from Mole Balances topic in division Basic Concepts of Chemical Reaction Engineering
Answer» 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.

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