Last updated on Sep 22, 2026

Relative Formula Mass (AQA GCSE Chemistry Combined Science): Quizzes

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Relative Formula Mass

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What is the symbol for relative atomic mass?

$A_r$

Which atom is used as the standard for comparing relative atomic mass?

Carbon-12

Where can you find the $A_r$ values for different elements?

On the periodic table

Do $A_r$ and $M_r$ values have units?

No, they are just numbers

What is the symbol for relative formula mass?

$M_r$

What is relative formula mass ( $M_r$ ) used for?

Compounds

What is the first step when calculating $M_r$ of a compound?

Look at the chemical formula

What is the $M_r$ of carbon dioxide ( $CO_2$ )? ( $A_r$ of C $=$ 12, O $=$ 16)

44

How is $M_r$ calculated for ionic compounds like sodium chloride (NaCl)?

In the same way as other compounds

To calculate $M_r$ , what do you do with the $A_r$ value of each element?

Multiply by number of atoms then add up

Explore AQA GCSE Chemistry Combined Science Revision Notes by Topics

Measurement, Mass & Equations

Calculating Mass of Substances

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Measurement, Mass & Equations

Calculating Mass of Substances

Explore AQA GCSE Chemistry Combined Science Flashcards by Topics

Measurement, Mass & Equations

Calculating Mass of Substances

Explore AQA GCSE Chemistry Combined Science Exam Questions by Topics

Measurement, Mass & Equations

Calculating Mass of Substances

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