Đáp án:
\(\begin{array}{l}
a)\\
{V_{B{r_2}}} = 0,5l = 500ml\\
b)\\
{V_{B{r_2}}} = 1l = 1000ml
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
a)\\
{C_2}{H_4} + B{r_2} \to {C_2}{H_4}B{r_2}\\
{n_{{C_2}{H_4}}} = \dfrac{{2,24}}{{22,4}} = 0,1mol\\
{n_{B{r_2}}} = {n_{{C_2}{H_4}}} = 0,1mol\\
{V_{B{r_2}}} = \dfrac{{0,1}}{{0,2}} = 0,5l = 500ml\\
b)\\
{C_2}{H_2} + 2B{r_2} \to {C_2}{H_2}B{r_4}\\
{n_{{C_2}{H_2}}} = \dfrac{{2,24}}{{22,4}} = 0,1mol\\
{n_{B{r_2}}} = 2{n_{{C_2}{H_2}}} = 0,2mol\\
{V_{B{r_2}}} = \dfrac{{0,2}}{{0,2}} = 1l = 1000ml
\end{array}\)