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Chemistry · Oct / Nov 2017 · Paper 11 · Question 31

5070Formulae

Octane, C8H18, is a hydrocarbon that undergoes combustion in a petrol engine. ...W...C8H18 + ...X...O2 → ...Y...CO2 + ...Z...H2O Which row shows the figures needed to balance the equation?

  1. AW 1, X 8, Y 8, Z 9
  2. BW 1, X 17, Y 8, Z 9
  3. CW 2, X 16, Y 8, Z 9
  4. DW 2, X 25, Y 16, Z 18

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Correct answer: D. W 2, X 25, Y 16, Z 18

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