Voltage vs Gibbs


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305385703
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Joined: Thu Jul 11, 2019 12:15 am

Voltage vs Gibbs

Postby 305385703 » Sun Mar 01, 2020 11:33 pm

Why is voltage positive when the reaction is spontaneous while the gibbs free energy is negative?

PranaviKolla2B
Posts: 114
Joined: Fri Aug 30, 2019 12:17 am

Re: Voltage vs Gibbs

Postby PranaviKolla2B » Sun Mar 01, 2020 11:34 pm

Is voltage negative when the gibbs free energy is positive?

Philomena 4F
Posts: 27
Joined: Wed Feb 27, 2019 12:16 am

Re: Voltage vs Gibbs

Postby Philomena 4F » Sun Mar 01, 2020 11:48 pm

A negative Gibbs free energy means a spontaneous reaction. From the eq deltaG= -nFE, a positive E will still result to a negative value. If it's a negative E, then deltaG would be positive since the negative sign in front of n will be cancelled out and turn to a positive sign. That in turn will be a non spontaneous reaction.


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