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Hydrocarbons burn in excess oxygen to form carbon dioxide and water. 20 cm of a gaseous hydrocarbon burned in an excess of oxygen, 200 cm. After cooling, the volume of the residual gas at r.t.p. was 150 cm, 50 cm of which was oxygen. (i) Determine the volume of the oxygen used. (ii) Determine the volume of the carbon dioxide formed. (1) (iii) The hydrocarbon was an alkane. Determine the formula of the hydrocarbon.

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