3. Paccrabbie . ripeo6pa308aB cxemil 1 ypannenus peakinif. peakilun. K+O_(2)=K_(2)O_(2) Al+C=Al_(4)C_(1) Cu(NO_(3))_(2)=CuO+NO_(2)+O_(2) Al_(2)(SO_(4))_(1)+Mg-MgSO_(4)+Al FeBr_(3)+Cl_(2)=FeCl_(3)+Br_(2) KMnO_(4)=K_(2)MnO_(2)+MnO_(2)+O_(2) NaOH+H_(3)PO_(4)=Na_(3)PO_(4)+H_(2)O Fc+O_(2)+H_(2)O=Fe(OH)_(2) NO_(2)+O_(2)+H_(2)O=HNO_(3)

It appears that the chemical equations provided are not balanced. Let's correct and balance each equation:<br /><br />1. $2K + O_{2} = 2K_{2}O$<br />2. $2Al + 3C = 2Al_{4}C_{3}$<br />3. $Cu(NO_{3})_{2} = CuO + 2NO_{2} + O_{2}$<br />4. $Al_{2}(SO_{4})_{3} + 3Mg = 3MgSO_{4} + 2Al$<br />5. $2FeBr_{3} + 3Cl_{2} = 2FeCl_{3} + 3Br_{2}$<br />6. $2KMnO_{4} = K_{2}MnO_{4} + MnO_{2} + O_{2}$<br />7. $3NaOH + H_{3}PO_{4} = Na_{3}PO_{4} + 3H_{2}O$<br />8. $4Fe + 3O_{2} + 6H_{2}O = 4Fe(OH)_{3}$<br />9. $4NO_{2} + O_{2} + 2H_{2}O = 4HNO_{3}$<br /><br />Please note that the corrected equations are balanced and represent the correct stoichiometry for each reaction.