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Homework question

Posted: Sun Feb 25, 2018 11:39 pm
by Megan Purl 1E
How would one express the units for rate constants when the concentrations are in moles per liter and time is in seconds for zero-order reactions?

Re: Homework question

Posted: Mon Feb 26, 2018 7:12 am
by RyanS2J
For a zero order reaction, since rate = k, the units of k would simply be moles per liter per second, or mol•L^-1•s^-1.

Re: Homework question

Posted: Mon Feb 26, 2018 10:57 am
by Gevork 2E
Hi,

I think it would also be better to know where the units are coming from with the use of the equation that we used in class.
rate = k[A]^n

Using this, let's see what happens when we are in a third order reaction (just an example, you can use this for anything):
k = rate/[A]^3
= mol x L^-1 x s^-1/ (mol x L^-1)^3
= L^2 x mol^-2 x s^-1