5.1.8

Relative Formula Mass

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Relative Formula Mass (Mr)

The relative formula mass (Mr) of a substance is equal to the mass of 1 mole of that substance (in grams). For an element, this is the same as the relative atomic mass.

Illustrative background for CarbonIllustrative background for Carbon ?? "content

Carbon

  • The mass of 1 mole of carbon is 12 g, which is the same as the relative atomic mass of carbon.
Illustrative background for Carbon dioxideIllustrative background for Carbon dioxide ?? "content

Carbon dioxide

  • Every carbon dioxide molecule has 1 carbon atom and 2 oxygen atoms:
    • Ar of carbon = 12.
    • Ar of oxygen = 16.
      • Mr of carbon dioxide = 12 + (2 x 16) = 44.

Jump to other topics

1States of Matter

2Elements, Compounds & Mixtures

3Atomic Structure

4The Periodic Table

5Chemical Formulae, Equations & Calculations

6Bonding

7Electrolysis

8Groups of the Periodic Table

9The Atmosphere

10Reactivity Series

11Metal Extraction

12Acids & Alkalis

13Chemical Tests

14Physical Chemistry

15Organic Chemistry

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