Phương trình nào là phương trình phản ứng hóa hợp? (to là t độ) a. 2KClO3 to→ 2KCl + 3O2 b. CaCO3 to→ CaO + CO2 c. Fe + 2HCl → FeCl2 + H2 d. 2H2 + O2 → 2H2O e. 2Fe(OH)3 → Fe2O3 + 3H2O  f. Na2O + H2O → 2NaOH

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