1. The problem statement, all variables and given/known data First question on PDF: http://ars-chemia.net/Classes/102/Problem_Sets/Practice Exam for Exam 1 Key.pdf 2. Relevant equations I used the initial rates method: Rate2/Rate1=k2*[A]^m/k1*[A]^m 3. The attempt at a solution When I solve these types of problems with the initial rates method, I get multiple possible solutions. For instance, for reactant B, I got -2.5 when comparing rates 3 and 2, but when comparing rates 3 and 1 I got -0.5. I know the answer is -0.5. My question is how do I know which one is the most plausible answer when solving these types of problems?