\(n_{hh}=\frac{0,25}{22,4}=\frac{5}{448}\left(mol\right)\)
\(Cl_2+2KI\rightarrow2KCl+I_2\)
\(n_{Cl2}=n_{I2}=\frac{1,27}{254}=0,005\left(mol\right)\)
\(\Rightarrow n_{H2,HCl}=\frac{5}{448}-0,005=\frac{69}{11200}\left(mol\right)\)
Khí thoát ra là H2
\(\Rightarrow n_{H2}=\frac{0,08}{22,4}=\frac{1}{280}\left(mol\right)\)
\(n_{HCl}=\frac{69}{11200}-\frac{1}{280}=\frac{29}{11200}\left(mol\right)\)
\(\Rightarrow\%V_{HCl}=\frac{\frac{29}{11200}}{\frac{5}{448}}.100\%=23,2\%\)