JEE Main 2016 Chemistry question

5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is

(1)Isobutane
(2)Ethane
(3)Butane
(4)PropaneCorrect

Answer: (4)

Solution

By Avogadro's law, volumes of gases at the same temperature and pressure are in the same ratio as their moles, so one volume of alkane needs volumes of oxygen. The combustion of a general alkane is

C_nH_{2n+2} + O_

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Question ID VK-115536