Quantitative analysis
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Propane-1,2-diol, C3H8O2\text{C}_3\text{H}_8\text{O}_2C3​H8​O2​, can be manufactured using two different commercial pathways.

  • Method A: Hydrolysis of propylene oxide
C3H6O+H2O→C3H8O2 \text{C}_3\text{H}_6\text{O} + \text{H}_2\text{O} \rightarrow \text{C}_3\text{H}_8\text{O}_2 C3​H6​O+H2​O→C3​H8​O2​ atom economy=100% \text{atom economy} = 100\% atom economy=100%
  • Method B: Reaction of 1-chloropropan-2-ol with sodium hydroxide
CH3CH(OH)CH2Cl+NaOH→CH3CH(OH)CH2OH+NaCl \text{CH}_3\text{CH(OH)CH}_2\text{Cl} + \text{NaOH} \rightarrow \text{CH}_3\text{CH(OH)CH}_2\text{OH} + \text{NaCl} CH3​CH(OH)CH2​Cl+NaOH→CH3​CH(OH)CH2​OH+NaCl atom economy=56.5% \text{atom economy} = 56.5\% atom economy=56.5%

Explain why Method A has an atom economy of 100%.

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Quantitative analysis Questions

Practise Edexcel GCSE Chemistry Quantitative analysis with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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