1.
Azo isopropane decomposes according to the equation:

(CH3)2CHN=NCH(CH3)2(g)→250–290°CN2(g)+C6H14(g)(\text{CH}_3)_2\text{CHN=NCH}(\text{CH}_3)_2\text{(g)} \xrightarrow{250\text{–}290°\text{C}} \text{N}_2\text{(g)} + \text{C}_6\text{H}_{14}\text{(g)}


It is found to be a first order reaction. If the initial pressure is P0P_0 and the pressure of the mixture at time tt is PtP_t, then the rate constant kk would be: