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Ferric sulphate is used in water and sew...

Ferric sulphate is used in water and sewage treatment and in removal of suspended impurities. Its empirical formula is `Fe_(2)(SO_(4))_(3)`. Calculate the mass percentage of iron, sulphur and oxygen in this compound.

Text Solution

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Molar mass of `Fe_(2)(SO_(4))_(3)`
`=2 xx 56 + 3(32 + 4 xx 16) = 400`
Mass of iron `=2 xx 56 = 112`
Mass percentage of iron `=(2 xx 56)/400 xx 100 = 28%`
Mass of sulphur `=32 xx 3 = 96`
Mass percentage of sulphur `=96/400 xx 100 = 24%`
Mass of oxygen `=3 xx 64 = 192`
Mass percentage of oxygen `=192/400 xx 100 = 48%`
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