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Chemical reactions and calculations

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By Expert Faculty of Sri Chaitanya
Question

The mass of copper that will be deposited at cathode in electrolysis of 0.2 M solution of copper sulphate when a quantity of electricity equal to that required to liberate 2.24 L of hydrogen from 0.1 M aqueous H2SO4 is passed (atomic mass of Cu = 63.5) will be

Moderate
Solution

1F=1Eq of H2=11.2L of H2

11.2L of H2=1Eq of H2

2.24L of H2=2.2411.2=0.2Eq

0.2Eq of Cu will be deposited. 

1Eq of Cu=63.52g

0.2Eq of Cu=63.52×0.2=6.35g


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