theo đè bài: cứ 7 gam Fe kết hợp với 3 gam Oxi

\(\Rightarrow\)số mol nguyên tử Fe là= 7/56=0,125(mol) kết hợp với số mol n.tử Oxi là= 3/16=0,1875(mol)

\(\Rightarrow\)\(\frac{nFe}{nO}=\frac{0,125}{0,1875}=\frac{2}{3}\)

Vậy CTHH của hợp chất là Fe₂O₃

phương pháp so sánh, nêu định nghĩa, giải thích, nêu ví dụ,

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