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3.2 Energetics

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Question 23

Carbon monoxide is oxidised to form carbon dioxide.

2CO+O2→2CO2 \mathrm{2CO + O_{2} \rightarrow 2CO_{2}} 2CO+O2​→2CO2​

The displayed formulae of carbon monoxide, oxygen and carbon dioxide are C≡O\mathrm{C{\equiv}O}C≡O, O=O\mathrm{O{=}O}O=O and O=C=O\mathrm{O{=}C{=}O}O=C=O respectively.

BondC≡O\mathrm{C{\equiv}O}C≡OO=O\mathrm{O{=}O}O=OC=O\mathrm{C{=}O}C=O
Bond energy (kJ/mol\mathrm{kJ/mol}kJ/mol)1077498805

What is the energy change when carbon monoxide is oxidised according to this equation?

[1]
A

+1042 kJ/mol+1042\,\mathrm{kJ/mol}+1042kJ/mol

B

−568 kJ/mol-568\,\mathrm{kJ/mol}−568kJ/mol

C

−1645 kJ/mol-1645\,\mathrm{kJ/mol}−1645kJ/mol

D

+568 kJ/mol+568\,\mathrm{kJ/mol}+568kJ/mol

Markscheme

3.2 Energetics Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Energetics

106 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.

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