Medium
From the rate expression for the following reaction,determine its order of reaction and the dimensions of the rate constant.
$H_2 O_2+3 I^{-}+2 H^{+} \rightarrow 2 H_2 O+I_3^{-} \text { Rate }=k\left[H_2 O_2\right]\left[I^{-}\right]$
$H_2 O_2+3 I^{-}+2 H^{+} \rightarrow 2 H_2 O+I_3^{-} \text { Rate }=k\left[H_2 O_2\right]\left[I^{-}\right]$
(N/A) Given Rate $= k[H_2O_2][I^{-}]$
The order of reaction is the sum of the powers of the concentration terms in the rate law expression.
Order $= 1 + 1 = 2$
Dimension of $k = \frac{\text{Rate}}{[H_2O_2][I^{-}]}$
$= \frac{\text{mol L}^{-1} \text{s}^{-1}}{(\text{mol L}^{-1})(\text{mol L}^{-1})}$
$= \text{L mol}^{-1} \text{s}^{-1}$
The order of reaction is the sum of the powers of the concentration terms in the rate law expression.
Order $= 1 + 1 = 2$
Dimension of $k = \frac{\text{Rate}}{[H_2O_2][I^{-}]}$
$= \frac{\text{mol L}^{-1} \text{s}^{-1}}{(\text{mol L}^{-1})(\text{mol L}^{-1})}$
$= \text{L mol}^{-1} \text{s}^{-1}$
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