Question

The percentage by mass of water of crystallisation in hydrated copper sulphate is
[Given: Atomic mass of Cu= 63.5 u, H= 1 u, O=16 u, S=32 u]​

Answer 1

Answer:

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The molecular weight of water H

2

O=2(1)+16=18g/mol.

The molecular weight of copper sulphate pentahydrate CuSO

4

.5H

2

O=64+32+4(16)+5(18)=250g/mol.

The percentage of water of crystallization in CuSO

4

.5H

2

O=

250

5×18

×100=36%.