\(\begin{array}{l}
1)\\
a)\\
C{H_4} + 2{O_2} \to C{O_2} + 2{H_2}O\\
2{H_2} + {O_2} \to 2{H_2}O\\
b)\\
hh:C{H_4}(a\,mol),{H_2}(b\,mol)\\
nhh = \dfrac{{22,4}}{{22,4}} = 1\,mol\\
n{H_2}O = \dfrac{{32,4}}{{18}} = 1,8\,mol\\
a + b = 1\\
2a + b = 1,8\\
\Rightarrow a = 0,8;b = 0,2\\
Vkk = (0,8 \times 2 + 0,1) \times 5 \times 22,4 = 190,4l\\
2)\\
a)\\
{C_2}{H_4} + B{r_2} \to {C_2}{H_4}B{r_2}\\
nB{r_2} = \dfrac{{16}}{{160}} = 0,1\,mol\\
\Rightarrow n{C_2}{H_4} = nB{r_2} = 0,1\,mol\\
\Rightarrow V{C_2}{H_4} = 0,1 \times 22,4 = 2,24l\\
VC{H_4} = 6,72 - 22,4 = 4,48l\\
b)\\
\% VC{H_4} = \dfrac{{4,48}}{{6,72}} \times 100\% = 66,67\% \\
\% V{C_2}{H_4} = 100 - 66,67 = 33,33\%
\end{array}\)