Question

Answer 1

a) \(\left\{{}\begin{matrix}\%Al=\dfrac{54}{102}.100\%=52,94\%\\\%O=100\%-52,94\%=47,06\%\end{matrix}\right.\)

b) \(\left\{{}\begin{matrix}\%K=\dfrac{78}{138}.100\%=56,52\%\\\%C=\dfrac{12}{138}.100\%=8,7\%\\\%O=100\%-56,52\%-8,7\%=34,78\%\end{matrix}\right.\)

c) \(\left\{{}\begin{matrix}\%Fe=\dfrac{168}{232}.100\%=72,41\%\\\%O=100\%-72,41\%=27,59\%\end{matrix}\right.\)

d) \(\left\{{}\begin{matrix}\%Mg=\dfrac{24}{84}.100\%=28,57\%\\\%C=\dfrac{12}{84}.100\%=14,29\%\\\%O=100\%-28,57\%-14,29\%=57,14\%\end{matrix}\right.\)