Chemistry - Chemical Kinetics Question with Solution | TestHub

The rate law is : rate = $k[A{]}^2\left[B\right]$...(1)

The rate of the reaction when the concentration of A is Trippled and B is kept constant:

${\mathrm{r}}_1=\mathrm{k}{\left[3\mathrm{A}\right]}^2\left[\mathrm{B}\right]$

${\mathrm{r}}_1=9\mathrm{k}{\left[\mathrm{A}\right]}^2\left[\mathrm{B}\right]$.....(2)

From equation first and second:

${\mathrm{r}}_1= 9\mathrm{r}$

Thus, the rate is increased by a factor of 9.