Question

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

• A. $\frac{d [Br_2]}{dt} = - \frac{3}{5} \frac{d [Br^-]}{dt}$
• B. $\frac{d [Br_2]}{dt} = - \frac{5}{3} \frac{d [Br^-]}{dt}$
• C. $\frac{d [Br_2]}{dt} = \frac{5}{3} \frac{d [Br^-]}{dt}$
• D. $\frac{d [Br_2]}{dt} =\frac{3}{5} \frac{d [Br^-]}{dt}$

Answer 1

Answer: (A)

$-\frac{1}{4} \frac{ d \left( Br ^{-}\right)}{ dt }=-\frac{1}{3} \frac{ d \left( Br _{2}\right)}{ dt }$

$\frac{ d \left( Br _{2}\right)}{ dt }=-\frac{3}{5} \frac{ d \left( Br ^{-}\right)}{ dt }$