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Chemistry, 04.09.2021 14:00 fatimahellis33

Cho chất a gồm fe và oxi. Biết oxi chiếm 30%khối lượng. Tìm công thức hoá học của a

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Cho chất a gồm fe và oxi. Biết oxi chiếm 30%khối lượng. Tìm công thức hoá học của a...

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