When 30 cm3 of a gaseous hydrocarbon was exploded with 210cm3 of oxygen the residual gases occupied a volume of 150cm3. After shaking the residual gases with excess aqueous sodium hydroxide, the final volume was 30cm3.(All volumes were measured at room temperature and pressure.)  (b) Deduce the volume of oxygen that actually reacted with 30 cm3 of the hydrocarbon

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