HW 7B.3 Part C

[Erik Buetow 1F]

for this question on the homework, how would we set up the equation to solve for the rate constant if the reaction goes from 2A---->B+C if we are given A(o) and that after 115 seconds we are given the concentration of B?

[Delaney Smith 1C]

Since you have the initial concentration of A, [A]o, and you are given the number of moles for each reactant and product, you can solve to find [A]t which you can then plug into the equation ln[A]t=-kt+ln[A]o to solve for k.

To find [A]t you would subtract the mole ratio of A to B times the concentration of B after 115 seconds, from the initial concentration of A
[A]t=(0.153molA/l)-[(2molA/1molB)(0.034molB/L)= 0.085molA/L=[A]t

[Nico Medina]

I was wondering this too, thanks for the help!