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Question

What is the percentage composition of iron in ferric sulphate, given mass of iron is 56 amu?


A

14%

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B

28%

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C

42%

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D

56%

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Solution

The correct option is B

28%


Chemical formula of Ferric Sulphate - Fe2(SO4)3

The atomic of Fe = 56, S = 32 and O = 16

Molar Mass of the compound =56×2+(16×4+32)×3=400

Percentage composition of Fe
= 56×2400×100 = 28%


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