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6.2 Organic chemistry

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Question 10

A chemist identifies alkane R in a sample of petrol. Each molecule of R contains 11 more hydrogen atoms than carbon atoms.

Alkanes have the general formula CnH2n+2\mathrm{C_{n}H_{2n+2}}Cn​H2n+2​.

Relative atomic mass (ArA_rAr​): C = 12.0 H = 1.0

What is the relative formula mass of alkane R?

[1]
A

142

B

128

C

126

D

156

Markscheme

6.2 Organic chemistry Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Organic chemistry

131 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.

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