d
rate of appearnce / disappearance \(=\pm \frac{1}{\text { stoichiometric coefficient }} \times \frac{[\text { reactant or product }]}{\text { time taken }}\) for the reactionn \(B r O_{3}^{-}(a q)+5 B r^{-}(a q)+6 H^{+} \rightarrow 3 B r_{2}(l)+3 H_{2} O(l)\)

rate of appearance of bromine \(\left(B r_{2}\right)\) \(=+\frac{1}{3} \frac{d\left[B r_{2}\right]}{d t}\)

rate of disappearance of bromise ion \(\left(B r^{-}\right)\) \(=-\frac{1}{5} \frac{d\left[B r^{-}\right]}{d t}\)

or \(\frac{d\left[B r_{2}\right]}{d t}=-\frac{3}{5} \frac{d[B r]}{d t}\)