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6.2 Quantitative analysis

6.2 Quantitative analysis

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Question 62

Urea, (NH2)2CO(\text{NH}_2)_2\text{CO}(NH2​)2​CO, is a widely used nitrogen-based fertilizer. It is manufactured industrially by reacting ammonia with carbon dioxide according to the following equation:

2NH3+CO2→(NH2)2CO+H2O 2\text{NH}_3 + \text{CO}_2 \rightarrow (\text{NH}_2)_2\text{CO} + \text{H}_2\text{O} 2NH3​+CO2​→(NH2​)2​CO+H2​O

Calculate the percentage atom economy for the production of urea in this reaction.

Relative formula masses (MrM_rMr​):

  • NH3=17.0\text{NH}_3 = 17.0NH3​=17.0
  • CO2=44.0\text{CO}_2 = 44.0CO2​=44.0
  • (NH2)2CO=60.0(\text{NH}_2)_2\text{CO} = 60.0(NH2​)2​CO=60.0
  • 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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