In the reaction $C_2H_4(g)+3O_2(g)->2CO_2(g)+2H_2O(g)$, if 2.70 mol $C_2H_4$ is reacted with 6.30 mol $O_2$, what is the limiting reagent?

Md Ariful Islam

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Md Ariful Islam

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Why can I say "clearly"? The stoichiometric equation you have posted shows that 1 mole of ethylene requires 3 moles of oxygen gas (the diatomic molecule).

Thus, 2.70 mol ethylene requires 8.10 mol dioxygen gas for complete reaction. How do I know this? I know this because of the given reaction . In the absence of stoichiometric oxygen, incomplete carbon combustion may occur to give $C$ (as soot), or $C-=O$, as oxidation products (or both), but I assume complete combustion, and only consider the reaction AS WRITTEN.

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