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Chemistry, 04.09.2021 14:20 he0gaubong
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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