Chemical Reactions, Stoichiometry, and the Mole (HSC SSCE Chemistry): Flashcards

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Limiting Reagent Calculations
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Limiting reagent definition

Reactant completely consumed in a chemical reaction

What limiting reagent determines

Maximum amount of product that can be formed

Excess reagent definition

Reactant not completely used up; remains after reaction

Why excess reagent can't be used for calculations

Some remains unreacted after reaction is complete

How to identify limiting reagent

Use molar ratios from balanced equation to compare amounts

Formula to convert mass to moles

n=mMn = \frac{m}{M}

First step in limiting reagent problems

Write balanced chemical equation

Which reagent to use for product calculations

Only the limiting reagent

Which reactant is limiting reagent

The one that runs out first

First conversion when given masses of reactants

Convert masses to moles using n=mMn = \frac{m}{M}

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