IF 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.

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Solution

Gay Lussac's law called the Law of combining volumes and it states that the ratio between the volumes of the reactant gases and the products can be expressed in simple whole numbers.
If we write balanced chemical equation for the reaction ofwith. We find that 1 mol of reacts with 1 mol of to give 2 moles of HCl.
$H_{2} (g) + C l_{2} (g) ⟶ 2 H C l$
That is 1 volume of reacts with 1 volume of
4 L of will combine with 4 L of .
The ratio of $H_{2} : {C l}_{2} i s 1 : 1$
Since is excess it will be left as residual gas.
Thus, Volume of gas left = 6L - 4L = 2L

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