If the initial concentration of substance A is 1.5 M and after 120 seconds the concentration of substance A is 0.75 M, the rate constant for the reaction if it follows zero - order kinetics is:
(a) 0.00625 molL-1s -1
(b) 0.00625 s -1
(c) 0.00578 molL-1s -1
(d) 0.00578 s -1

Solution