Spontaneity  [ENDORSED]






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melissa_dis4K
Posts: 106
Joined: Fri Sep 28, 2018 12:28 am

Spontaneity

Postby melissa_dis4K » Wed Feb 27, 2019 6:21 pm

How can I determine whether a reaction is spontaneous or not from given delta S of the system and delta S of the surroundings? Thanks!

Patrick Cai 1L
Posts: 93
Joined: Fri Sep 28, 2018 12:25 am

Re: Spontaneity

Postby Patrick Cai 1L » Wed Feb 27, 2019 6:43 pm

Typically, if only considering entropy of a reaction, if delta S is positive, then the reaction is considered spontaneous. However, there are more cases where temperature and enthalpy would need to be considered (Gibbs free energy equation).

melissa_dis4K
Posts: 106
Joined: Fri Sep 28, 2018 12:28 am

Re: Spontaneity

Postby melissa_dis4K » Wed Feb 27, 2019 7:13 pm

This is regarding Karen's Gibbs Free energy worksheet question 2. It says:
Use the following values for entropy, determine if a reaction would be spontaneous for each case.
a. delta S system= 30J/K ; delta S surroundings= 50 J/K
Thanks

melissa_dis4K
Posts: 106
Joined: Fri Sep 28, 2018 12:28 am

Re: Spontaneity  [ENDORSED]

Postby melissa_dis4K » Wed Feb 27, 2019 7:19 pm

Nvm! Delta S of universe = delta S (system) + delta S (surr) and if this is greater than 0 then it is spontaneous!


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