Relative Formula Mass (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

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Relative Formula Mass
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Relative atomic mass (Ar)

Way to measure atomic mass compared to carbon-12

Symbol for relative atomic mass

Ar

Standard atom for comparing Ar

Carbon-12 atom

Location of Ar values

Periodic table

Units for Ar values

No units (just numbers)

Relative formula mass (Mr)

Relative mass of a compound

Symbol for relative formula mass

Mr

How to calculate Mr

Multiply Ar by no. of atoms, then add all together

Ar value of carbon (C)

12

Ar value of oxygen (O)

16

Mr of CO2\text{CO}_2

44

Units for Mr values

No units (relative values)

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