How many?

Chemistry Level 3

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


The answer is 2.52.

Son Nguyen by Son Nguyen , 20, Vietnam

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