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2014-12-18T13:55:56+05:30

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Atomic wt of copper = 63.546
atomic wt of sulphur = 32.06
atomic wt of oxygen = 16
that of hydrogen = 1

total molecular weight of penta hydrate cooper II sulphate is
   = 249.606
weight of 5 water molecules  = 90

percentage = 90/249.606  * 100 = 36.06 %

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