Question

For the reaction $H_{2}\left(g\right)+Br_{2}\left(g\right)\to2HBr\left(g\right)$ the experimental data suggested that $r=k\left[H_{2}\right]\left[Br_{2}\right]^{1/2}$ The molecularity and order of the reaction are respectively:

• A. $2, 3/2$
• B. $3/2, 3/2$
• C. Not defined, $3/2$
• D. $1,1/2$

Answer 1

Answer: (C)

$H_{2}\left(g\right)+Br_{2}\left(g\right)\to2HBr\left(g\right)$
$r=k\left[H_{2}\right]\left[Br_{2}\right]1/2$
Molecularity $\to$ not defined. $\left(\because complete\, reaction\right)$
order $=1+\frac{1}{2}=\frac{3}{2}$