Question

5. The percentage of water of crystallization in hydrated BaCl2 is found to be 14.75.
Determine the molecular formula of hydrated BaCl2
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Answer 1

Answer:

The molecular formula of hydrated barium chloride,$BaCl_2.2H_2O$

Explanation:

Molar mass of barium chloride = 208.23 g/mol

Formula of hydrated barium chloride =$BaCl_2.xH_2O$

Molar mass of hydrated barium chloride =208.23 g/mol + x(18 g/mol)

Percentage of water of crystallization in hydrate = 14.75 %

Percentage of water crystallization:

$\frac{\text{Total mass of water}}{M}\times 100$

M = Total molar mass of hydrated salt

$14.75\%=\frac{18 g/mol\times x}{208.23 g/mol + x(18 g/mol)}\times 100$

x = 2

The molecular formula of hydrated barium chloride,$BaCl_2.2H_2O$