Sapling Week9/10 #12

[Pratika Nagpal]

Can someone explain the steps for solving this question

[Jeffrey Doeve 2I]

Hi Pratika, we can solve this problem by using process of elimination for half life equations. We can first eliminate first order because the half life changed with different initial concentrations. In our first order half life equation(t_1/2 = 0.693/k), there is no initial concentration. As a result, we would expect k to be constant and half life to remain the same even if initial concentration is changed. Next, we would eliminate zeroth order because as our initial concentration decreased from 0.254 to 0.157, our half life increased(t_1/2 = [A]₀/2k. We would expect this reaction order to be second order because half life and initial concentration are inversely related. Thus, the k units would be 1/Ms.

[Nico Medina]

I was wondering this too, thanks for the help!

[Pratika Nagpal]

Thanks for the help!