2 NO ( g )+ Cl_2( g ) ⇌ 2 NOCl ( s ) This reaction was studied at -10^° C and the following data was obtained [ NO ]_0 and [ Cl_2]_0 are the initial…

$$2 \mathrm{NO}(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NOCl}(\mathrm{~s}) $$ This reaction was studied at $\displaystyle -10^{\circ} \mathrm{C}$ and the following data was obtained

run	$\displaystyle [\mathrm{NO}]_0$	$\displaystyle \left[\mathrm{Cl}_2\right]_0$	$\displaystyle \mathrm{r}_0$
$\displaystyle 1$	$\displaystyle 0.10$	$\displaystyle 0.10$	$\displaystyle 0.18$
$\displaystyle 2$	$\displaystyle 0.10$	$\displaystyle 0.20$	$\displaystyle 0.35$
$\displaystyle 3$	$\displaystyle 0.20$	$\displaystyle 0.20$	$\displaystyle 1.40$

$\displaystyle [\mathrm{NO}]_0$ and $\displaystyle \left[\mathrm{Cl}_2\right]_0$ are the initial concentrations and $\displaystyle \mathrm{r}_0$ is the initial reaction rate. The overall order of the reaction is \_\_\_\_. (Round off to the Nearest Integer).