[CHM 111] Practice

[Andrew J. Pounds]

On 11/02/2017 04:45 PM,
> Good Afternoon,
> I am doing Ch 18 practice problems and I am lost on a problem. I know 
> that in order to predict the sign of entropy change, you can look at 
> which side of the reaction has more moles of gas. What do you do when 
> both sides have the same # of gas moles?
> For example:
> PCl3 (l) + Cl2 (g) —> PCl5 (g)
>
>
>
In this case the entropy would be greater in the products because there 
are lots more places to put the energy.  Think about the Cl2 molecule -- 
you basically have the one bond length and then the rotation about the 
axes.  In PCl5 you have give different bonds to store energy plus the 
rotations about the axes.


-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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