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mAl(OH)3=27u+3*16u+3*1u=78u
3u-x%
78u-100%
x=3u*100%/78u
x=3,85%H
wodorotlenek potasu- KOH
mKOH=39u+16u+1u=56u
1u-x%
56u-100%
x=1u*100%/56u
x=1,79%H