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Posted: Wed Feb 27, 2019 6:21 pm
by melissa_dis4K
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!

Re: Spontaneity

Posted: Wed Feb 27, 2019 6:43 pm
by Patrick Cai 1L
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).

Re: Spontaneity

Posted: Wed Feb 27, 2019 7:13 pm
by melissa_dis4K
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

Re: Spontaneity  [ENDORSED]

Posted: Wed Feb 27, 2019 7:19 pm
by melissa_dis4K
Nvm! Delta S of universe = delta S (system) + delta S (surr) and if this is greater than 0 then it is spontaneous!