Chemistry
Barium chloride crystals contain 14.8% water of crystallisation. Find the number of molecules of water of crystallisation per molecule.
Mole Concept
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Answer
Barium chloride = BaCl2.xH2O
Molecular weight of BaCl2.xH2O = Ba + 2Cl + x(2H + O)
= 137 + (2 x 35.5) + x(2+16)
= 137 + (2 x 35.5) + x(2+16)
= 137 + 71 + 18x
= (208 + 18 x)
(208 + 18 x) contains 14.8% of water of crystallisation in BaCl2.x H2O
∴ 14.8% of (208 + 18 x) = 18x
x [208 + 18 x] = 18x
[0.148 x 208 ] + [0.148 x 18x] = 18x
30.784 = 18x - [0.148 x 18x]
30.784 = 18x - 2.664x
30.784 = 15.336x
x = = 2
Hence, Barium chloride crystals contain 2 molecules of water of crystallisation per molecule.
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