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The following results were obtained when an hydrated zinc salt, ZnSO4.xH20 was heated to a...

The following results were obtained when an hydrated zinc salt, ZnSO4.xH20 was heated to a constant mass, to obtain the anhydrous salt. What is the value of x ?

Weight of the crucible = 10.00g
Weight of the crucible and Crystals = 14.10g
Weight of the crucible and residue = 12.30g
(Zn= 65, S= 32, O=16, H= 1)?

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