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13.34g of Na2So4.xH2O was heated to give hydrous salt weighing 8.7g 1.Calculate the value of...

13.34g of Na2So4.xH2O was heated to give hydrous salt weighing 8.7g
1.Calculate the value of x
2.Give the formula of hydrated salt
3.Calulate the percentage of H2O of crystallization.
Pls show working?

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