Розставте коефіціенти в рівняннях реакцій :
а) K + O 2 → K 2 O
б) KCIO 3 → KCI + O 2
в) CuO + HNO 3 → Cu (NO 3 ) 2 + H 2 O
г) Fe(OH) 3 → Fe 2 O 3 + H 2 O
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