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An alloy of iron and carbon was treated ...

An alloy of iron and carbon was treated with suphuric acid, in which only iron reacts
`2Fe(s) + 3H_(2)SO_(4)(aq) rarr Fe_(2)(SO_(4))_(3)(aq) + 3H_(2)(g)` If a sample of alloy weighing 140 g gave 6 g hydrogen, What is the percentage of iron in the alloy?

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