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2Fe(OH)3+3H2S== Fe2S3+6H2O
Fe(OH)3 + H2S ==2Fe(OH)2+S+2H2O
Fe(OH)2 + H2S== FeS+2H2O
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2Fe2S2+3O2+6H2O== 4Fe(OH)3+6S
4FeS+3O2+6H2O ==4Fe(OH)2+4S
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Fe2O3H2O+3H2S=Fe2S3H2O+3H2O