Molar entropy v standard entropy of formation

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Kyra Dingle 1B
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Molar entropy v standard entropy of formation

Postby Kyra Dingle 1B » Sat Feb 10, 2018 9:31 pm

What is the difference between molar entropies and standard entropy of formation? Why do we use molar entropies to find the standard reaction entropies and not standard entropies of formation?

Emilie Hoffman 1E
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Re: Molar entropy v standard entropy of formation

Postby Emilie Hoffman 1E » Sat Feb 10, 2018 9:44 pm

The entropies that we use in the back of the book (the molar entropies) are inherently standard, which is indicated by the little degree sign. We use standard molar entropies so that we can use the same number to calculate the standard entropy of many reactions.

Juanyi Tan 2K
Posts: 33
Joined: Fri Sep 29, 2017 7:05 am

Re: Molar entropy v standard entropy of formation

Postby Juanyi Tan 2K » Sun Feb 11, 2018 3:36 am

Molar entropy is the entropy content of one mole of substance under a standard state, and it is absolute. Normally, we only use enthalpy of formation and you will not see entropy of formation

mayapartha_1D
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

Re: Molar entropy v standard entropy of formation

Postby mayapartha_1D » Mon Feb 19, 2018 3:18 pm

Molar entropy is only for one mole of the substance, while standard entropy is just the general entropy for the formation of the product!

Hope that helps.


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