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ICSE Class 10 Answered

A mixture of hydrogen and chlorine occupying 36 cm3 was exploded. On shaking it with water, 4cm3 of hydrogen was left behind. Find the composition of the mixture.
Asked by aashimegh | 04 Sep, 2019, 08:53: AM
answered-by-expert Expert Answer

The chemical equation is given by:

space space space straight H subscript 2 space space space space plus space space space 2 Cl subscript 2 space space end subscript space rightwards arrow with blank on top space 2 HCl 1 space mol space space space space space space space 1 space mol space space space space space space space space 2 space mol

1 mole Hydrogen H2 reacts with 1 mole chlorine Cl2 to form 2 moles of HCl.

Therefore, 1 vol H2 reacts with 1 vol Cl2 and forms 2 vol HCl.

H2 and Cl2 reacts in equal volumes.

As 4 cm3 H2 is left after the completion of reaction, the volume of gases reacting must be 16 cm3 H2 and 16 cm3 Cl2

Hence, the composition of mixture is:   

16 + 4 = 20 cm3 of H2 and 16 cm3 of Cl2.

Answered by Varsha | 04 Sep, 2019, 11:42: AM

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