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Molar Entropies

Posted: Wed Feb 15, 2017 4:18 pm
by Coco Hailey 2E
When deciding which has the higher molar entropy, I understand that it depends on molar mass and residual energy. Which trumps which?
In other words if one compound had a greater mass but less residual energy and the other compound a lower mass and more residual energy which molecule would have the higher molar entropy? Which matters more - the number of positions of the compound or the mass?

Re: Molar Entropies

Posted: Wed Feb 15, 2017 4:22 pm
by MelanieAu1G
It depends primarily on the conditions that they are asking you about the entropy under. If they are asking you about entropy at 0 K, there is no thermal entropy to consider, therefore only residual entropy needs to be accounted for (this is based off of the number of positions/ arrangements for a molecule and then the mass, mass is last priority). If it is asking about entropy at 25 C, or any other non-zero temperature (non-zero as in K), then you would have to consider thermal entropy and then residual entropy.

Re: Molar Entropies

Posted: Wed Feb 15, 2017 4:24 pm
by Coco Hailey 2E
thanks so much! But what do you mean by thermal energy?

Re: Molar Entropies

Posted: Thu Feb 16, 2017 4:35 pm
by jeree pucan
thermal energy as in heat q

Re: Molar Entropies

Posted: Fri Feb 17, 2017 2:52 pm
by 404757006
So when does molar mass come in as a factor of more/less entropy?