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A mixture of CuSO(4).5H(2)O" and "MgSO(4...

A mixture of `CuSO_(4).5H_(2)O" and "MgSO_(4)`. `7H_(2)O` was heated until all the water was driven-off. if 5.0 g of mixture gave 3 g of anhydrous salts, what was the percentage by mass of `CuSO_(4).5H_(2)O` in the original mixture ?

Text Solution

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Let the mixture contain x g `CuSO_(4).5H_(2)O`
`rArr x/249.5 times 159.5+(5-x)/246 times 120=3 rArr x=3.70`
`rArr " percentage of "CuSO_(4).5H_(2)O=3.56/5 times 100`
`=74.07%`
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