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Question

A mixture of hydrogen and chlorine occupying 36cc was exploded. On shaking it with water, 4cc of hydrogen was left behind. Find the composition of the mixture.


Solution

Hydrogen and chlorine when reacted together form Hydrogen chloride (HCl).
H2+Cl22HCl
When mixed with water, HCl dissolves in water.
HCl+H2OH3O+Cl
Now, the point is, that the excess hydrogen left after dissolving in water is the unreacted hydrogen.
Now, H2+Cl22HCl
So, 1 mole of H2
reacts with Cl2
1 mole of every gas occupies 22.4 litres at room teperature.
So, 22.4 litre of H2 reacts with Cl2
1 litre of H2 reatcs with Cl2
1 cc ofH2 reacts with 1 cc ofCl2
Total volume initially was 36 cc, and H2 left at last was 4 cc.
So, 36 - 4 =32 cc of volume of mixture reacted.
1 cc of H2 reacts with 1 cc of Cl2, so out of the 32 cc 16 cc was H2 and 16 cc was Cl2
So, mixture had  16 + 4 = 20 cc H2 and 16 cc of Cl2

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