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What is the percentage of water of cryst...

What is the percentage of water of crystallisation in a pure sample of washing soda `(Na_(2)CO_(3).10 H_(2)O)` ?

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The correct Answer is:
0.6294
Molecular mass of `Na_(2)CO_(3).10H_(2)O=46+12+48+180=286.0u`
Percentage of water of crystallisation `= ((180u))/((286u))xx100=62.94%`.
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