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Question

Determine the percentage of water of crystallization in a sample of green vitriol.

A
45.32%
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B
31.26%
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C
22.59%
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D
75.45%
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Solution

The correct option is A 45.32%
Molecular formula of green vitriol is FeSO4.7H2O.

Formula mass = 56+32+(4×16)+(7×(2+16))=278 amu

Mass of water of crystallization =7×18=126 amu

% of water of crystallization =(126/278)×100=45.32%

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