Flash Education

Question

Calculate the percentage of water of crystallization in hydrated copper sulphate [CuSO4.5H2O].
[Cu = 63.5, S = 32, O = 16, H = 1]

Percentage Composition

Chemistry, Class 10, ICSE, J Dalal

August 1, 2024

Answer

Molecular weight of hydrated copper sulphate CuSO₄.5H₂O

= 63.5 + 32 + 4(16) + 5[2(1) + 16]

= 63.5 + 32 + 64 + 5[18]

= 63.5 + 32 + 64 + 90

= 249.5 g

249.5 g of CuSO₄.5H₂O contains 90 g of water of crystallization.

∴ Percentage of water of crystallization

= $90\over249.5$ ×100 = 36%

Hence, percentage of water of crystallization is 36%

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