Some chemical reactions of organic compounds
2 marks · EasyPropane ([31m[0m) burns in a large supply of oxygen.
Write the balanced chemical equation for the complete combustion of propane.
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Common mistakes: Incorrect balancing of O2 or H2O; Incorrect products (e.g., formation of CO or incomplete combustion)
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Marking points
M1 (a) · 1 mark · Correct reactants and products for complete combustion of propane ([31m[0m to [31m[0m and [31m[0m).
A1 (a) · 1 mark · Equation balanced: .
Worked solution
Combustion of propane produces carbon dioxide and water:
Balance C: 3 on both sides.
Balance H: 8 on left, so need 4H2O (4 d 2 = 8 H).
Balance O: right side has 3 x 2 (CO2) + 4 x 1 (H2O) = 6 + 4 = 10 O; so 5O2 needed on left.