A 6.85g sample of the hydratedSr(OH)2.x ...

A `6.85g` sample of the hydrated`Sr(OH)_2.x H_2O` is dried in an oven to given `3.13g` of anhydrous `sr(OH)_2.` What is the value of `x?` (Atomic masses : `Sr=87.60.O=16.0,H=1.0)`

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