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Question

The crystalline salt Na2SO4.xH2O on heating loses 55.9% of its mass and becomes anhydrous. The formula of the crystalline salt is:

A
Na2SO4.5H2O
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B
Na2SO4.7H2O
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C
Na2SO4.2H2O
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D
Na2SO4.10H2O
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Solution

The correct option is D Na2SO4.10H2O
Molecular mass of Na2SO4.xH2O=142+18x
On heating, crystalline salt will lose water of crystallization and eventually lose its weight.
So, 55.9% is the mass % of water dehydrated from total amount i.e. 18x
55.9=18x142+18x×100
Solving for x gives, x=9.9910

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