The following mechanism has been proposed for the reaction of NO with ${\mathrm{Br}}_2$ to form NOBr

${\mathrm{NO}}_{\left(\mathrm{g}\right)}+{{\mathrm{Br}}_2}_{\left(\mathrm{g}\right)}\to {{\mathrm{NOBr}}_2}_{\left(\mathrm{g}\right)},{{\mathrm{NOBr}}_2}_{\left(\mathrm{g}\right)}+{\mathrm{NO}}_{\left(\mathrm{g}\right)}\to 2{\mathrm{NOBr}}_{\left(\mathrm{g}\right)}$

If the second step is the rate determining step, the order of the reaction with respect to NO (g) is

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