Difficult
$A$ sample of a hydrate of barium chloride weighing $61 \ g$ was heated until all the water of hydration was removed. The dried sample weight is $52 \ g$. The formula of the hydrated salt is: (atomic mass: $Ba = 137 \ amu, Cl = 35.5 \ amu$)
- A$BaCl_2 \cdot 4H_2O$
- B$BaCl_2 \cdot 3H_2O$
- C$BaCl_2 \cdot H_2O$
- D$BaCl_2 \cdot 2H_2O$
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