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Monitoring chemical reactions

Monitoring chemical reactions

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Question 25

During the monitoring of the catalytic oxidation of a hydrocarbon, a crystalline intermediate is isolated. Elemental analysis shows that this intermediate has the empirical formula C2H3O2\text{C}_2\text{H}_3\text{O}_2C2​H3​O2​. A mass spectrum of the reaction mixture reveals that the molecular ion peak for this intermediate is at m/z=118.0m/z = 118.0m/z=118.0. What is the molecular formula of this intermediate?

Relative atomic masses (ArA_{\text{r}}Ar​): C=12.0\text{C} = 12.0C=12.0, H=1.0\text{H} = 1.0H=1.0, O=16.0\text{O} = 16.0O=16.0.

A

C2H3O2\text{C}_2\text{H}_3\text{O}_2C2​H3​O2​

B

C8H12O8\text{C}_8\text{H}_{12}\text{O}_8C8​H12​O8​

C

C4H6O4\text{C}_4\text{H}_6\text{O}_4C4​H6​O4​

D

C6H9O6\text{C}_6\text{H}_9\text{O}_6C6​H9​O6​

Markscheme

Monitoring chemical reactions Questions

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

91 exam-style questions on OCR GCSE Chemistry Monitoring chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.

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