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Quantitative analysis

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Question 61

Ethanol, C2H5OH\text{C}_2\text{H}_5\text{OH}C2​H5​OH, is a widely used biofuel and chemical feedstock. It can be synthesized on an industrial scale using two distinct chemical pathways:

  • Method 1: Direct catalytic hydration of ethene
C2H4+H2O→C2H5OH \text{C}_2\text{H}_4 + \text{H}_2\text{O} \rightarrow \text{C}_2\text{H}_5\text{OH} C2​H4​+H2​O→C2​H5​OH

atom economy = 100%

  • Method 2: Anaerobic fermentation of glucose
C6H12O6→2C2H5OH+2CO2 \text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 2\text{C}_2\text{H}_5\text{OH} + 2\text{CO}_2 C6​H12​O6​→2C2​H5​OH+2CO2​

atom economy = 51.1%

Explain why Method 1 has an atom economy of exactly 100%.

[1]

Quantitative analysis Questions

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

Practise Edexcel GCSE Chemistry Quantitative analysis with exam-style questions for Foundation and Higher tier. 119 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.

Question bank