Question

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.

  • Percentage Composition
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Answer

H2 + Cl2 → 2HCl
1 vol : 1 vol 2 vol

To calculate the amount of hydrogen used

Cl2 : H2
1 : 1
4 : x

⇒ x = 1\over 1 × 4 = 4 lit

Remaining hydrogen = 6 – 4 = 2 lit.

To calculate the amount of HCl :

Cl2 : HCl
1 : 2
4 : x

⇒ x = 2\over 1 × 4 = 8 lit

Hence, after reaction 8 lit of HCl is formed which dissolves in water and 2 lit of hydrogen is left.

∴ 2 lits. of hydrogen is left.

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