Questions...

A couple email questions....

Someone asked about #5 and #9 from the problem set that was handed out on the day I missed class. All the questions on that problem set are from previous problem sets, so you should be able to find answer keys posted on my web page under Previous Gen Chem II.

For #5, we will ultimately need to plug into the comparative form of the Arrhenius equation, so we need to wrestle the information given into rate law constants and temperatures. The rate law expression is given, so we can plug in the room temperature rate and the given concentrations to find "k_room". We can also plug in to get "k_unknown". With the given activation energy and the appropriate value of R (8.314 ^J/_mol.K), you can plug in all of the values in the comparative Arrhenius equation and solve for T_unknown. Make sure you pay attention to units, E_a is given in kJ and R uses J, you have to convert one of them before you solve for T_unknown or you'll have a random factor of 1000 floating around in your problem.

For #9, we're looking at integrated rate law problems. In all cases, we're using the 1st order IRL because the problem tells us that the reaction is 1st order w.r.t. Cl₂(g). For all parts, plug in what you know and solve for the variable.

Other questions, let me know and I'll post answers to the blog.....