How many?

Chemistry Level pending

Heated \(m\) (g) \(\ce{Fe}\) in the oxygen we received \(3\text{ g}\) mixed of \(X\) included \(\ce{Fe_{3}O_{4}}; \ce{FeO}\) and \(\ce{Fe}\) still remain. Dissolved \(X\) in hot concentrated of \(\ce{H_{2}SO_{4}}\) we received 0,84 liters of \(\ce{SO_{2}}\) in standard conditions. Find \(m\).

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