Relative Atomic Mass (A-Level IB Chemistry)

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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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Really useful explanation. Was reading my Pearson IB chemistry and struggled to understand why, or logic. Thank you for details of history, did not realise some of these are changes less than 100 years ago. Shows impact of technology.

TartanMicrobe