## Molar entropies

905022356
Posts: 48
Joined: Mon Oct 02, 2017 7:19 am

### Molar entropies

I am confused, what are standard molar entropies and what do we use them for?

manasa933
Posts: 72
Joined: Fri Sep 29, 2017 7:04 am

### Re: Molar entropies

They are molar entropies taken under standard conditions with pure forms of the substance. (1 bar and usually, 298K unless specified otherwise)

905022356
Posts: 48
Joined: Mon Oct 02, 2017 7:19 am

### Re: Molar entropies

Okay, I get that conceptually, but how do we calculate them? Do we measure them experimentally or?

Ishita Monga 1B
Posts: 31
Joined: Thu Jul 27, 2017 3:00 am

### Re: Molar entropies

905022356 wrote:Okay, I get that conceptually, but how do we calculate them? Do we measure them experimentally or?

If we have to use molar entropies in a calculation they will be given to us.

905022356
Posts: 48
Joined: Mon Oct 02, 2017 7:19 am

### Re: Molar entropies

okay, thanks, also, what is the difference between standard molar entropies and statistical entropies?

William Xu Dis 1D
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

### Re: Molar entropies

905022356 wrote:okay, thanks, also, what is the difference between standard molar entropies and statistical entropies?

I know that standard molar entropies are a measure that is absolute and definite at 25 Celsius. I believe that what you are referring to as statistical entropy is the ones calculated using degeneracy (number of ways to reach a possible state, which is related to the probability that a state is more ordered or less ordered.

An interesting video I saw explained entropy being driven by statistics, in that the universe tends to become more disordered simply because there are many more disordered states than ordered states, so probability simply drives it toward the more disordered states.

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