Question

Student as a piece of copper sulphate sul student as a piece of copper sulphate Crystal explain the method of calculating the number of Cu Crystal explain the method of calculating the number of Cu SO4 Molecule in that Crystal ( given atomic mass copper is equal to 63 sulphur is equal to 32 and oxygen is equal to 16

Answer 1

Assuming you mean the blue crystal cupric sulfate, blue vitriol, just add up the atomic weights.

CuSO4 -
Copper, 1 * 63.5
Sulfur, 1* 32
Oxygen, 4*16 (=64)

So by weight, there are 63.5 parts copper in 159.5, or about 40%.

But wait - that's the anhydrous material. The blue crystal form is properly called cupric sulfate pentahydrate, because there are five additional water molecules included in the crystal. Each water molecule H2O weighs 18 (2+16), so that's an additional 90 parts deadweight. The copper content is 63.5 parts in 249.5, or about 25.5%.