For the first order thermal decomposition reaction, the following data were obained :

`C_(2)H_(5)CI(g) to C_(2)H_(4) (g) + HCI(g)`

`{:("Time/Sec", " " "Total pressure/atm"), (0, " " 0.30), (300, " " 0.50):}`

Calculate the rate constant

(Given : log 2= 0.301, log 3 = 0.4771, log 4=0.6021)