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The weight of 1 xx 10^(22) molecules of ...

The weight of `1 xx 10^(22)` molecules of `CuSO_(4).5H_(2)O` is

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The correct Answer is:
4.14
Molecular weight of `CuSO_(4).5H_(2)O = 63.5 + 32 + 64 + 90 = 249.5`
`6.022 xx 10^(23)` molecules weigh = 249.5 g
`1 xx 10^(22)` molecules weigh `=(249.5 xx 1 xx 10^(22))/(6.022 xx 10^(23)) = 4.14 g`
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