Corect: oxidul de aluminiu are formula chimica: Al2O3, hidroxidul de sodiu are formula chimica: NaOH, acidul sulfuric are formula chimica : H2SO4, clorura de sodiu are formula chimica: NaCl, carbonatul de potasiu are formula chimica: K2CO3, Incorect: oxidul de aluminiu are formula chimica: Al3O2, hidroxidul de sodiu are formula chimica: Na(OH)2, acidul sulfuric are formula chimica : H2SO3, clorura de sodiu are formula chimica: NaCl2, carbonatul de potasiu are formula chimica: KCO3,

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