I keep getting “Limiting reagent” questions wrong in Some Basic Concepts (Mole Concept). What's the trap?
assuming the reactant with the smaller mass is limiting.
The usual trap: assuming the reactant with the smaller mass is limiting. How to avoid it: convert each reactant to moles, divide by its coefficient — the smallest wins. Go back to the definition — the reactant that runs out first and therefore caps how much product forms.
Key point
Limiting reagent
Common mistake
assuming the reactant with the smaller mass is limiting.
Memory tip
convert each reactant to moles, divide by its coefficient — the smallest wins.
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