Last updated on Sep 22, 2026

Limiting Reactants (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Quizzes

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Limiting Reactants

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What is a limiting reactant?

The reactant used up first

What happens when the limiting reactant is used up?

The reaction stops

How many moles of $CuO$ are in $7.95 g$ if $Mr$ of $CuO$ is $79.5$ ?

$0.1$ moles

How many moles of $C$ are in $7.2 g$ if $Ar$ of $C$ is $12$ ?

$0.6$ moles

What is the mole ratio of $CuO$ to $C$ in the balanced equation?

$2:1$

In the reaction, which substance is the limiting reactant?

$CuO$

How many moles of $C$ are needed to react with $0.1$ moles of $CuO$ ?

$0.05$ moles

What mass of $Cu$ is produced from $0.1$ moles if $Ar$ of $Cu$ is $63.5$ ?

$6.35 g$

What mass of $CO_2$ forms from $0.05$ moles if $Mr$ of $CO_2$ is $44$ ?

$2.2 g$

Why does the reaction stop even if $C$ remains?

All $CuO$ is used up

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Revision Notes by Topics

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Calculating Mass of Substances

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Calculating Mass of Substances

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