Outlining what relative atomic mass is and why it is now based on carbon-12. Determining relative atomic mass using percentage abundances of isotopes is shown with examples.

For AQA, OCR (A), Edexcel and CIE A-level and IB Chemistry.

What is relative atomic mass?: 00:18
Why carbon-12?: 03:03
Dealing with isotopes: 04:29
Example - relative atomic mass of chlorine: 05:03
Summary: 06:11

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