\(a,Al_2\left(SO_4\right)_3\\ \%m_{Al}=\dfrac{27.2}{27.2+96.3}.100\approx15,79\%\\ \%m_S=\dfrac{32.3}{27.2+96.3}.100\approx28,07\%\\ \Rightarrow\%m_O\approx56,14\%\\ b,Mg\left(NO_3\right)_2\\ \%m_{Mg}=\dfrac{24}{24+62.2}.100\approx16,22\%\\ \%m_N=\dfrac{14.2}{24+62.2}.100\approx18,92\%\\\Rightarrow \%m_O\approx64,86\%\)
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