\(pthh:C+O_2\overset{t^o}{--->}CO_2\left(1\right)\)
\(S+O_2\overset{t^o}{--->}SO_2\left(2\right)\)
Ta có: \(\left\{{}\begin{matrix}n_C=\dfrac{6}{12}=0,5\left(mol\right)\\n_S=\dfrac{8}{32}=0,25\left(mol\right)\end{matrix}\right.\)
Theo pt(1): \(n_{O_2}=n_C=0,5\left(mol\right)\)
Theo pt(2): \(n_{O_2}=n_S=0,25\left(mol\right)\)
\(\Rightarrow m_{O_{2_{cần.dùng}}}=0,5.32+0,25.32=24\left(g\right)\)
Chọn B