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6.2 Quantitative analysis

6.2 Quantitative analysis

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Question 63

Calculate the percentage atom economy for the production of zinc oxide (ZnO{\text{ZnO}}ZnO) in the following thermal decomposition reaction:

ZnCO3→ZnO+CO2 \text{ZnCO}_3 \rightarrow \text{ZnO} + \text{CO}_2 ZnCO3​→ZnO+CO2​

You must show your working.

(Relative atomic masses, ArA_rAr​: C=12\text{C} = 12C=12, O=16\text{O} = 16O=16, Zn=65\text{Zn} = 65Zn=65; Relative formula mass, MrM_rMr​: ZnO=81\text{ZnO} = 81ZnO=81)

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Markscheme

6.2 Quantitative analysis Questions

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

157 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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