w(Al)=Ar(Al)*индекс/Mr(Al2O3)=27*2/102=52.94\%
<span>HNO3+BACl2 не идет</span>
<span>16HCl + 2KMnO4 = 2KCl + 2MnCl2 </span><span>+ 5Cl2 + 8H2O</span>