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6.2 Quantitative analysis

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Question 62

Oxygen can be prepared by heating potassium chlorate. Potassium chloride is also formed.

2KClO3→2KCl+3O2 \mathrm{2KClO_3 \rightarrow 2KCl + 3O_2} 2KClO3​→2KCl+3O2​
ProductRelative formula mass, MrM_rMr​
KCl\mathrm{KCl}KCl74.5
O2\mathrm{O_2}O2​32.0
a.

Calculate the atom economy for oxygen in this reaction.

[3]
b.

Explain why collecting more of the oxygen produced would not change the atom economy of the reaction.

[2]
Markscheme

6.2 Quantitative analysis Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Quantitative analysis

151 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.

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