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Question

Barium chloride crystals contain 14.8% water of crystallisation. Find the number of molecules of water of crystallisation per molecule.

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Solution

BaCl2.nH2O
Atomic mass of Ba =137 g
Atomic mass of Cl= 35.5 g
Molecular mass of H2O = 18
BaCl2.nH2O = 137+ 71 + 18n
[208+18n] contains water = 14.8 % water in BaCl2.nH2O

%ofwater=weightofwaterweightofsalt×100

14.8=18n208+18n×100

[208+18n] contains water = [208+18n]×14.8100=18n
[208+18n] contains water =[104+9n]2×14.8=1800n
=1917×n=3848
n=38481917=2.00732
2 molecule of water of crystallisation are present in 1 molecule of BaCl2


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