K.L.P.T= 27.2+16.3=102
\(a,\%Al=27.2.100\div102=52,94\%\)
\(\%O=100-52,94=47,06\%\)
K.L.P.T=39.2+12+16.3=138
\(\%K=39.2.100\div138=56,52\%\)
\(\%C=12.100\div138=8,70\%\)
\(\%O=100-\left(56,52+8,7\right)=34,78\%\)
\(c,\) K.L.P.T= 56.3+16.4=232
\(\%Fe=56.3.100\div232=72,41\%\)
\(\%O=100-72,41=27,59\)
\(d,\) K.L.P.T= 24+12+16.3=84 <amu>
\(\%Mg=24.100\div84=28,57\%\)
\(\%C=12.100\div84=14,29\%\)
\(\%O=100-28,57-14,29=57,14\%\)
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