Homework Assignment #2

Due January 26, 2018 by 11:10 a.m.

Consider the reaction:

[Co(NH3)5Cl]2+(aq) + [Co(CN)5]3–(aq) → [Co(CN)5Cl]3–(aq) + Co2+(aq) + 5 NH3(aq)

The initial concentration of each reactant is equal to the fourth and fifth digits of your Student ID Number divided by 105 M = Cinit. (If your ID number is 123456789, then Cinit = 45/105 =4.5×10–4 M.) At some temperature, after 25 s, the concentrations of each reactant are reduced by 15 %.

  1. What is the average rate of reaction for the first 25 s in terms of the loss of [Co(CN)5]3–?

  2. What is the average rate of reaction for the first 25 s in terms of the gain of NH3?

  3. The rate law at 25 °C is found to be Rate = k[Co(NH3)5Cl2+] [Co(CN)53–] with k=5.0×107 M–1s–1. What is the initial rate at 25 °C?

Turn in the following on a clean, full sheet of paper (not torn out of a notebook):

Name

Student ID Number

The answers to questions a, b, and c. Show your work.