Chemistry path · GCSE Chemistry

When do mole amounts become whole-number coefficients?

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Practice question

An aluminium chloride process uses 5.40 g of aluminium and 21.3 g of chlorine gas to make 26.7 g of aluminium chloride, AlCl₃. Relative atomic masses are Al = 27 and Cl = 35.5. Use the masses to determine the balanced equation involving Al, Cl₂ and AlCl₃, and explain how the mole amounts lead to the coefficients.

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Official curriculum

4.3.2.3 Balancing equations from masses

This challenge practises knowledge and exam skills from the official GCSE science curriculum. Use these sources to see the exact subject content and its wider Key Stage 4 context.

AQA specification 4.3.2.3 Balancing equations from masses GOV.UK Key Stage 4 science programme

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