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An impure sample of FeS₂ is burnt with sufficient O₂ to produce Fe₂O₃ and SO₂. If weight loss was found to 3% of initial impure sample then find the % purity of FeS₂ in sample (Fe=56, S=32)
4FeS₂ + 11O₂ -> 2Fe₂O₃ + 8SO₂
Sagot :
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