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An iron rod of 20g is kept immersed for ...

An iron rod of 20g is kept immersed for some time in an aqueous solution of `CuSO_(4)`. Then the rod is taken out from the solution and weighed. The observed mass is found to be reduced to 13.84g. On the other hand, this chemical reaction displaces 6.985g of copperr. if the equivalent mass of iron is 28, what will be the equivalent mass of copper ?

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Decrease in the mass of Fe=(20-13.84)g=6.16g
`therefore`Amount of dissolved Fe=6.16g`=(6.16)/(928)`gram-equivalent
Amount o Cu displaced=6.985g.
`therefore (6.985)/(E)=(6.16)/(28) or, E=31.75`.
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