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5.1 Monitoring chemical reactions

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Question 5
F

Ethene can be made from ethanol. Water is a waste product.

C2H5OH→C2H4+H2O \mathrm{C_{2}H_{5}OH \rightarrow C_{2}H_{4} + H_{2}O} C2​H5​OH→C2​H4​+H2​O

Relative formula mass (MrM_rMr​): C2H4\mathrm{C_{2}H_{4}}C2​H4​ = 28.0 H2O\mathrm{H_{2}O}H2​O = 18.0

Use the equation: atom economy = Mr of desired producttotal Mr of all products×100\displaystyle \frac{M_r\text{ of desired product}}{\text{total }M_r\text{ of all products}}\times100total Mr​ of all productsMr​ of desired product​×100

What is the atom economy for making ethene?

[1]
A

60.9%

B

64.3%

C

100%

D

155.6%

Markscheme

5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

57 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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