13.4 g of a sample of unstable hydrated salt : Na2SO4.nH2O was found to contain 6.3 g of water. Determine the number of water of crystallisation.

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answer is C.

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Detailed Solution

wt. of waterwt. of sample = wt. of water in the compoundmol. wt. of the compound6.313.4 =x× 18142+18xx=7

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