Question
Explain order and molecularity of elementary reactions.
✓
Answer
(1) The order and molecularity of elementary reaction are same.
(2) Consider second order bimolecular reaction,
$2 NO _{2( g )} \rightarrow 2 NO _{( g )}+ O _2 \text {. }$
(3) The rate of the reaction is given by, Rate $= k \left[ NO _2\right]^2$
(4) Similarly consider unimolecular first order reaction,
$\begin{aligned}
& C _2 H _5 I _{( g )} \rightarrow C _2 H _{4( g )}+ HI _{( g )} \\
& \text { Rate }= k \left[ C _2 H _5 I \right]
\end{aligned}$
(2) Consider second order bimolecular reaction,
$2 NO _{2( g )} \rightarrow 2 NO _{( g )}+ O _2 \text {. }$
(3) The rate of the reaction is given by, Rate $= k \left[ NO _2\right]^2$
(4) Similarly consider unimolecular first order reaction,
$\begin{aligned}
& C _2 H _5 I _{( g )} \rightarrow C _2 H _{4( g )}+ HI _{( g )} \\
& \text { Rate }= k \left[ C _2 H _5 I \right]
\end{aligned}$
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