For the reaction,H_{2(g)} + Br_{2(g)} longrig | vedclass

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(D) Molecularity is the number of reacting species taking part in an elementary reaction,which must collide simultaneously in order to bring about a c

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Bimolecular and $\frac{3}{2}$

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(D) Molecularity is the number of reacting species taking part in an elementary reaction,which must collide simultaneously in order to bring about a chemical reaction. For the given reaction,there are $2$ reactant molecules ($1$ molecule of $H_2$ and $1$ molecule of $Br_2$),so the molecularity is $2$ (Bimolecular). Order of reaction is the sum of the powers of the concentration terms in the rate law expression. Given rate law: $r = k[H_2]^1[Br_2]^{\frac{1}{2}}$. Order $= 1 + \frac{1}{2} = \frac{3}{2}$.

For the reaction,$H_{2(g)} + Br_{2(g)} \longrightarrow 2 HBr_{(g)}$,$r = k[H_2][Br_2]^{\frac{1}{2}}$. What is the molecularity and order of reaction respectively?

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