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Topic: Relationship dG and dSuniverse  (Read 1937 times)

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Offline gsel

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Relationship dG and dSuniverse
« on: May 22, 2014, 07:49:13 AM »
Hi,

Can someone please help explain the relation of change in entropy with the change in Gibbs energy?
Why does dG < 0 yield dS > 0 and a spontaneous reaction?

Thanks!
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Offline mjc123

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Re: Relationship dG and dSuniverse
« Reply #1 on: May 22, 2014, 10:07:05 AM »
What is the definition of dS?
If a system undergoes a process with enthalpy change dHsystem and entropy change dSsystem:
(i) what is the free energy change of the ststem dGsystem?
(ii) what is the entropy change of the surroundings dSsurroundings?
(iii) what is the entropy change of the universe dSsystem + dSsurroundings? How is this related to dGsystem?
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