Relative formula mass (AQA GCSE Chemistry): Flashcards

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Relative formula mass
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Relative formula mass definition

Total of all atomic masses in a chemical formula

Symbol for relative formula mass

MrM_r

Units of MrM_r

No units

Steps to calculate MrM_r

Look at formula, find atomic masses, add them up

Atomic mass of H\text{H}

1

Atomic mass of C\text{C}

12

Atomic mass of O\text{O}

16

MrM_r of H2O\text{H}_2\text{O}

18

MrM_r of O2\text{O}_2

32

MrM_r of CaCO3\text{CaCO}_3

100

How to handle brackets in formulas for MrM_r

Multiply everything inside by the number outside

MrM_r of Mg(OH)2\text{Mg(OH)}_2

58

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