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Question

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


Solution

The balanced equation is:

H2 + 2Cl2 -----> 2HCl
1mole H2 reacts with 1 mole Cl2 and forms 2 moles HCl

Therefore, 1vol H2 reacts with 1 vol Cl2 and forms 2 vol HCl
H2 and Cl2 react in equal volumes

4cm3 H2 was left after the reaction

Volume of gases reacting must be 16cm3 H2and 16cm3 Cl2 (due to 1:1 ratio)

Therefore initially: 16 + 4 = 20cm3 H2
and 16cm3 Cl2 were present


Chemistry

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