1. The problem statement, all variables and given/known data For the reaction A-->2B+C, the following data are obtained for [A] as a function of time: t=0min, [A]=0.80M; 8min, 0.60M; 24min, 0.35M; 40min, 0.20M. Calculate the rate of formation of B at t= 28 min. 3. The attempt at a solution I have found out that this equation is a first order reaction with equation: y=-0.0345145x-0.2270455 then I plug in the time 28 min into x in this equation and I got the ln=-1.1934515 =exp(-1.1934515)=0.3031730544 the rate for first order of reaction is k* (k=-slope), which is equal to 0.01046386638 I am wondering did I do the problem correctly? because I was told that it is a wrong answer. any comment or help would be great. Thank you very much.