calculate the percentage of copper, sulphur, oxygen and water of hydration in crystalline copper culphate, CuSO4.5H2O

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Solution

Molar mass of copper = 63.5 g
Molar mass of sulphur = 32 g
Molar mass of oxygen = 16 g
Molar mass of water = 18 g
Molar mass of CuSO₄.5H₂O = 249.72 g
$P e r c e n t a g e o f c o p p e r = \frac{63.5}{249.72} \times 100 = 25.4 % P e r c e n t a g e o f s u l p h u r = \frac{32}{249.72} \times 100 = 12.81 % P e r c e n t a g e o f o x y g e n = \frac{64}{249.72} \times 100 = 25.6 % P e r c e n t a g e o f w a t e r = \frac{90}{249.72} \times 100 = 36.04 %$

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