Trong mấy bài tính theo CTHH, ở dạng đề 2 là biết trước phần trăm của mỗi nguyên tố rồi suy ra CTHH ấy ạ, có bước Tìm số mol nguyên tử của mỗi nguyên tố . Sau khi tính ra được số mol nguyên tử của các nguyên tố trong CTHH thì lại kết luận luôn là số mol nguyên tử của nguyên tố(n) thì bằng chỉ số dưới chân mỗi KHHH(x,y,z...) ạ. Vì sao ạ? Giải thích hộ em chỗ n=x với ạ

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