Hoàn thành các PTHH sau bằng cách thêm hệ số và ghi rõ điều kiện của các phản ứng: a) CaO + HCl → CaCl2 + H2O b) Al + O2 → Al2O3 c) FeO + CO → Fe + CO2 d) Al + H2SO4 → Al2(SO4)3 + H2 e) BaCl2 + AgNO3 → Ba(NO3)2 + AgCl mik dốt lắm mn ạ

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