Вычислить массовые доли элементов соединениях а)ba(oh)2 б) al(mao4)3

Mr(Ba(OH)2) = 137+2*16+2*1 = 171
W(Ba) = 137/171 = 0.80=80%
W(O) = 32/171 = 0.19=19%
W(H)=2/171=0.01=1%

Mr(Al(SO4)3) = 27+3*32+12*16 = 315
W(Al) = 27/315 = 0.09=9%
W(S) = 96/315=0.30=30%
W(O)= 192/315 = 0.61=61%