A sample of a hydrate of barium chloride...

A sample of a hydrate of barium chloride weighing 61g was heated until all the water of hydration is removed. The dried sample weighted 52g. The formular of the hydrated salt is: (Atomic mass, Ba = 137 amu, Cl = 35.5 amu)

`BaCl_(2). 2H_(2)O`

`BaCl_(2).4H_(2)O`

`BaCl_(2).H_(2)O`

`BaCl_(2).3H_(2)O`

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