In an experiment to describe the rate of a reaction,Mg ribbon was made to react with a standard solution of HCl. The results of obtained were: Time(s):0,30,60,120,180,240,300 volume(cm^3):0,8,12,18,20,20,20 (a) calculate the method of the reaction by graph real method (b)At what part of the reaction was the rate greatest.​