Last updated on Sep 21, 2026

Measurement, Mass & Equations (AQA GCSE Chemistry): Quizzes

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Relative formula mass

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What is the symbol for relative formula mass?

$M_r$

Why does relative formula mass have no units?

It's a ratio compared to a standard

What does the 'r' in $M_r$ stand for?

Relative

What is the relative atomic mass of oxygen?

16

What is the $M_r$ of oxygen gas ( $O_2$ )?

32

What is the $M_r$ of water ( $H_2O$ )?

18

What is the relative atomic mass of carbon?

12

What is the $M_r$ of calcium carbonate ( $CaCO_3$ )?

100

What must you do with brackets in a formula?

Multiply everything inside by number outside

What is the $M_r$ of magnesium hydroxide ( $Mg(OH)_2$ )?

58

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