Units for delta G


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Riya Sood 4G
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Units for delta G

Postby Riya Sood 4G » Sat Feb 29, 2020 10:52 pm

When calculating dela G= -(n)(F)(Ecell), will the units for delta G be KJ/mol or just KJ?

Asha Agarwal 1E
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Re: Units for delta G

Postby Asha Agarwal 1E » Sat Feb 29, 2020 10:54 pm

The units will just be in kJ since the units in n and F cancel in terms of moles.

VPatankar_2L
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Re: Units for delta G

Postby VPatankar_2L » Sat Feb 29, 2020 11:16 pm

Since one Faraday is 96485 C/mol, it can be multiplied by n (moles) in the equation delta G = -nFE to just get kJ.

Alice Chang 2H
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Re: Units for delta G

Postby Alice Chang 2H » Sun Mar 01, 2020 12:48 am

Asha Agarwal 1E wrote:The units will just be in kJ since the units in n and F cancel in terms of moles.


I thought ∆G was in units of kJ since the textbook omits the assumed "/mol" part. A TA mentioned this to me as well in a previous topic. Was I wrong this whole time?

RobertXu_2J
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Re: Units for delta G

Postby RobertXu_2J » Sun Mar 01, 2020 3:07 am

Gibbs free ENERGY. delta G is literally referring to a change in energy, so it has the same units as those for energy, which is joules, so the answer would be kJ (kilojoules). Additionally, if you use the equation, you will find that it is kJ

Kayla Maldonado 1C
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Re: Units for delta G

Postby Kayla Maldonado 1C » Sun Mar 01, 2020 4:00 am

VPatankar_2L wrote:Since one Faraday is 96485 C/mol, it can be multiplied by n (moles) in the equation delta G = -nFE to just get kJ.

What are the units for E and how do we get to Joules from coulombs?

BAlvarado_1L
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Re: Units for delta G

Postby BAlvarado_1L » Sun Mar 01, 2020 8:48 am

delta G is given in kJ

Rodrigo2J
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Re: Units for delta G

Postby Rodrigo2J » Sun Mar 01, 2020 11:30 am

the unites for delta G would be kilojoules.

VPatankar_2L
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Re: Units for delta G

Postby VPatankar_2L » Sun Mar 01, 2020 12:48 pm

Kayla Maldonado 1A wrote:
VPatankar_2L wrote:Since one Faraday is 96485 C/mol, it can be multiplied by n (moles) in the equation delta G = -nFE to just get kJ.

What are the units for E and how do we get to Joules from coulombs?


The units for E are Volts, and one Volt = 1 J/C. So, when you multiply n (moles) by F (C/mol) and E ( V = J/C) you get J.

Jasmine W 1K
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Re: Units for delta G

Postby Jasmine W 1K » Sun Mar 01, 2020 4:59 pm

The unit would be kJ.

Elizabeth Harty 1A
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Re: Units for delta G

Postby Elizabeth Harty 1A » Sun Mar 01, 2020 5:01 pm

What is the difference between delta g naught and delta g?

Riya Sood 4G
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Re: Units for delta G

Postby Riya Sood 4G » Tue Mar 03, 2020 3:42 pm

Elizabeth Harty 1A wrote:What is the difference between delta g naught and delta g?


Delta G naught is for standard conditions at 25 degree celsius, 1 atm, 1 M. Delta G is for non-standard conditions.

Caroline Beecher 2H
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Re: Units for delta G

Postby Caroline Beecher 2H » Wed Mar 04, 2020 2:30 pm

Elizabeth Harty 1A wrote:What is the difference between delta g naught and delta g?

The units when you are talking about delta G naught would be kilojoules per mole, whereas under nonstandard conditions the units for delta G would be just kilojoules.

BAlvarado_1L
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Re: Units for delta G

Postby BAlvarado_1L » Tue Mar 17, 2020 10:18 am

Your answer will be given in KJ

Alan Cornejo 1a
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Re: Units for delta G

Postby Alan Cornejo 1a » Tue Mar 17, 2020 5:08 pm

Your units in the end, end up canceling eachother out with the exception of kj which is what you are calculating for deltaG.


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