- Hợp chất SO3
%S = MS : MSO3 .100% = 32 : 80 .100% = 40%
%O = 100% - 40% = 60%
- Hợp chất Fe2O3
%Fe = 2MFe : MFe2O3 . 100% = 2.56 : 160. 100% = 70%
%O = 100% - 70% = 30%
- Hợp chất CO2
%C = MC : MCO2 . 100% = 12 : 44 . 100% = 27,3 %
%O = 100% - 27,3% = 72,7%
\(\begin{array}{l} *SO_3:\\ \%S=\dfrac{32}{32+16\times 3}\times 100\%=40\%\\ \%O=\dfrac{16\times 3}{32+16\times 3}\times 100\%=60\%\\ *Fe_2O_3:\\ \%Fe=\dfrac{56\times 2}{56\times 2+16\times 3}\times 100\%=70\%\\ \%O=\dfrac{16\times 3}{56\times 2+16\times 3}\times 100\%=30\%\\ *CO_2:\\ \%C=\dfrac{12}{12+16\times 2}\times 100\%=27,27\%\\ \%O=\dfrac{16\times 2}{12+16\times 2}\times 100\%=72,73\%\end{array}\)