Bài 3 :
a) \(n_K=\dfrac{3,9}{39}=0,1\left(mol\right)\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(n_{CO2}=\dfrac{55}{44}=1,25\left(mol\right)\)
\(n_{Fe3O4}=\dfrac{58}{232}=0,25\left(mol\right)\)
b) \(n_{CO2\left(dktc\right)}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
\(n_{SO2\left(dktc\right)}=\dfrac{10,08}{22,4}=0,45\left(mol\right)\)
\(n_{H2\left(dktc\right)}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
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