\(n_{KMnO_4}=\frac{15.8}{158}=0.1\left(mol\right)\)
Phuong trinh hoa hoc:
\(2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2\)
Theo phuong trinh hoa hoc:
\(n_{O_2}=\frac{1}{2}n_{KMnO_4}=\frac{1}{2}\cdot0.1=0.05\left(mol\right)\)
\(n_S=\frac{3.2}{32}=0.1\left(mol\right)\)
Phuong trinh hoa hoc:
\(S+O_2\rightarrow SO_2\)
So mol ban dau 0.1 0.05
So mol phan ung 0.05 0.05 0.05
So mol sau phan ung 0.05 0 0.05
\(m_{SO_2}=0.05\cdot64=3.2\left(g\right)\)
\(V_{SO_2}=22.4\cdot0.05=1.12\left(l\right)\)