Question

Find the % of crystallization of water in each of the
following
a) Cu So4 5.H2O.


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Answer 1

Answer:

The % water of crystallisation in the crystals is 2.25 x 100 / 6.25 = 36% [ Ar's Cu=64, S=32, O=16, H=1 ] The mass ratio of CuSO4 : H2O is 4.00 : 2.25. To convert from mass ratio to mole ratio, you divide by the molecular mass of each 'species'

Answer 2

Answer:

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%.

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