13.4 g of a sample of unstable hydrated ...

`13.4 g` of a sample of unstable hydrated salt `Na_(2)SO_(4).XH_(2)O` was found to contains `6.3 g` of `H_(2) O`. The number of molecular of water of crystalistion is

A

6

B

5

C

7

D

8

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The correct Answer is:

C

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