\(S+O_2\underrightarrow{t^o}SO_2\)
\(1:1:1\left(mol\right)\)
\(0,08:0,08:0,08\left(mol\right)\)
\(n_{O_2}=\dfrac{V}{22,4}=\dfrac{22,4}{22,4}=1\left(mol\right)\)
\(n_{SO_2}=\dfrac{m}{M}=\dfrac{5,12}{64}=0,08\left(mol\right)\)
\(m_S=n.M=0,08.32=2,56\left(g\right)\)
\(n_{O_2}=n_{SO_2}=0,08\left(mol\right)\)
\(n_{O_2\left(dư\right)}=1-0,08=0,92\left(mol\right)\)
\(m_{O_2\left(dư\right)}=n.M=0,92.32=29,44\left(g\right)\)