When 15cm3 of a gaseous hydrocarbon P, was burnt in 100cm3 of oxygen, gaseous mixture occupied 70cm3 at room temperature and pressure. When the mixture was passed through potassium hydroxide, its volume decreased to 25cm3. a).What volume of the oxygen was used during the reaction? b).Determine the molecular formula of the hydrocarbon. (KCSE 2013 paper 1 question 23)
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