Specification Point 2.9:
Know the approximate percentages by volume of the four most abundant gases in dry air

The Composition of Air

The table below shows the approximate percentages by volume of the main gases in unpolluted, dry air:

Table composition of air, Edexcel IGCSE Chemistry

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.