GFE dividing by temp






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JosephineF
Posts: 49
Joined: Wed Sep 18, 2019 12:17 am

GFE dividing by temp

Postby JosephineF » Fri Feb 07, 2020 5:44 pm

Does anyone have a deeper explanation for why we would divide ΔG by T for the equation -ΔG/T= -ΔH/T + ΔSsys? In lecture I didn't understand what the purpose was for doing this.

CynthiaLy4F
Posts: 103
Joined: Sat Jul 20, 2019 12:16 am

Re: GFE dividing by temp

Postby CynthiaLy4F » Fri Feb 07, 2020 6:11 pm

I believe the purpose for that was to manipulate the equation to show how -deltaG/T of the system is equal to deltaS of the universe, which means that in order for a spontaneous process to occur where deltaS is positive, then deltaG must be negative.

Angela Patel 2J
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

Re: GFE dividing by temp

Postby Angela Patel 2J » Fri Feb 07, 2020 6:32 pm

Because - delta H / T is the change in entropy of the surroundings (discussed earlier in lecture today) and this makes the equation easier to simplify into something that only has one variable. This way we can define spontaneity of a process in terms of only gibbs free energy.

Rebekah Alfred 1J
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Re: GFE dividing by temp

Postby Rebekah Alfred 1J » Fri Feb 07, 2020 7:12 pm

We know if it is a spontaneous process if the delta S of the universe is positive, which means that the delta G of the system must be negative.


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