Spontaneity






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Lumbini Chandrasekera 1B
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Joined: Fri Sep 28, 2018 12:18 am

Spontaneity

Postby Lumbini Chandrasekera 1B » Sun Feb 17, 2019 10:55 pm

Given the value of Gibbs free energy, how do you know whether the reaction is spontaneous or not?

lindsey_ammann_4E
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: Spontaneity

Postby lindsey_ammann_4E » Sun Feb 17, 2019 10:57 pm

You know a reaction is spontaneous when delta G is negative. If it's positive, the reaction is not spontaneous.

mahika_nayak_3L
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Spontaneity

Postby mahika_nayak_3L » Sun Feb 17, 2019 11:06 pm

A reaction is spontaneous when the delta G value is negative. This indicates that the given reaction is favorable in that direction and will lead to a release in free energy, meaning that reactants have more free energy to do work than the products.

Michelle Nwufo 2G
Posts: 61
Joined: Fri May 18, 2018 3:00 am

Re: Spontaneity

Postby Michelle Nwufo 2G » Sun Feb 17, 2019 11:50 pm

mahika_nayak_3L wrote:A reaction is spontaneous when the delta G value is negative. This indicates that the given reaction is favorable in that direction and will lead to a release in free energy, meaning that reactants have more free energy to do work than the products.


Why does a negative value for delta g indicate that a reacton is spontaneous?

Olivia Young 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Re: Spontaneity

Postby Olivia Young 1A » Mon Feb 18, 2019 12:04 pm

Another way of telling if the reaction is spontaneous is if the change in entropy of the universe is positive (deltaS universe). This is because deltaS universe is equal to -(deltaG)/T. As long as deltaG is negative, the resulting value which equals deltaS universe will be positive, since the temperature in Kelvins cannot be negative.


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