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6.2 Quantitative analysis

6.2 Quantitative analysis

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Question 38

An industrial synthesis of bromoethane, a reagent used in alkylation reactions, involves reacting ethanol with hydrogen bromide:

C2H5OH+HBr→C2H5Br+H2O \text{C}_2\text{H}_5\text{OH} + \text{HBr} \rightarrow \text{C}_2\text{H}_5\text{Br} + \text{H}_2\text{O} C2​H5​OH+HBr→C2​H5​Br+H2​O

Calculate the atom economy for the production of bromoethane from ethanol and hydrogen bromide.

(relative formula masses: C2H5OH=46.0\text{C}_2\text{H}_5\text{OH} = 46.0C2​H5​OH=46.0, HBr=80.9\text{HBr} = 80.9HBr=80.9, C2H5Br=108.9\text{C}_2\text{H}_5\text{Br} = 108.9C2​H5​Br=108.9, H2O=18.0\text{H}_2\text{O} = 18.0H2​O=18.0)

Give your answer to one decimal place.

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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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