Question: how many moles of oxygen are required in the complete combustion of 1 mole of acetylene?
Answer: Complete combustion of a hydrocarbon occurs when oxygen gas in the surrounding air mixes completely and is present in the stoichiometric mole ratio to react completely with the amount of hydrocarbon. For acetylene, the mole ratio is five moles of oxygen per two moles of acetylene, or 2.5:1.