Thermal decomposition for ${\mathrm{N}}_2{\mathrm{O}}_{5\left(\mathrm{g}\right)}$  1^st order kinetics as per ${\mathrm{N}}_2{\mathrm{O}}_{5\left(\mathrm{g}\right)}\to 2{\mathrm{NO}}_{2\left(\mathrm{g}\right)}+$$\frac{1}{2}{\mathrm{O}}_{2\left(\mathrm{g}\right)}$ Initial presure of ${\mathrm{N}}_2{\mathrm{O}}_5$ is 100mm. After 10 minutes, the pressure developed is 130mm, what is rate constant?