Question

In the reaction
$Br{O}_3^{-}(aq)+5B{r}^{-}(aq)+6H^{+}\to 3B{r}_2(l)+3H_{2}O(l)$
The rate of appearance of bromine $\left(B{r}_2\right)$ is related to rate of disappearance of bromide ions as following

• A. $\frac{d[B{r}_2]}{dt}=-\frac{3}{5}\frac{d[B{r}^{-}]}{dt}$
• B. $\frac{d[B{r}_2]}{dt}=-\frac{5}{3}\frac{d[B{r}^{-}]}{dt}$
• C. $\frac{d[B{r}_2]}{dt}=\frac{5}{3}\frac{d[B{r}^{-}]}{dt}$
• D. $\frac{d[B{r}_2]}{dt}=\frac{3}{5}\frac{d[B{r}^{-}]}{dt}$

Answer 1

Answer: (A)

$-\frac{1}{4}\frac{d\left(B{r}^{-}\right)}{dt}=-\frac{1}{3}\frac{d\left(B{r}_2\right)}{dt}$

$\frac{d\left(B{r}_2\right)}{dt}=-\frac{3}{5}\frac{d\left(B{r}^{-}\right)}{dt}$