Units for Gibbs






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305421980
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Units for Gibbs

Postby 305421980 » Sun Mar 01, 2020 12:11 am

Why is it that sometimes delta G is in kj and other times it is in kj/mole when each time you have to incorporate moles?

305421980
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Re: Units for Gibbs

Postby 305421980 » Sun Mar 01, 2020 12:15 am

For example in calculating K in problem 5G21 the units used are only in KJ for the values of delta G

Alice Chang 2H
Posts: 101
Joined: Fri Aug 30, 2019 12:18 am

Re: Units for Gibbs

Postby Alice Chang 2H » Sun Mar 01, 2020 12:45 am

They're actually assuming that you know the units for ∆G to be kJ/mol. A lot of times, the textbook omits the "/mol" part because it is assumed to be included.

Eva Zhao 4I
Posts: 101
Joined: Sun Sep 29, 2019 12:16 am

Re: Units for Gibbs

Postby Eva Zhao 4I » Mon Mar 02, 2020 2:11 pm

As a general rule, anything with the ∆_r is per mole. Regarding ∆G (according to the reply of a similar question), free energy can have the units of kJ or kJ/mol depending on whether the question refers to the molar free energy of a substance or the free energy of a specific amount of the substance. Try to write out all your units and make sure they cancel properly to get the right units.


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