For a certain reaction of order $\mathrm{n}$, the time for half change, $t_{1/2}$ is given by $t_{1/2}=\frac{(2-\sqrt{2})}{k}\times C_0^{1/2}$ where $\mathrm{k}$ is constant and ${\mathrm{C}}_0$ is the initial concentration. What is $\mathrm{n}$?