Endothermic Favorable?
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 58
- Joined: Fri Sep 29, 2017 7:05 am
-
- Posts: 62
- Joined: Sat Jul 22, 2017 3:00 am
Re: Endothermic Favorable?
If you have an endothermic reaction, that means Delta H is positive. Delta S depends. If Delta S was positive, then by Delta G = Delta H - T*Delta S, the reaction would be favorable at high temperatures. If Delta S was negative, then the reaction would not be favorable at any temperature.
-
- Posts: 49
- Joined: Sat Jul 22, 2017 3:01 am
Re: Endothermic Favorable?
Look at the equation delta G = delta H - T(delta S)
If a reaction is endothermic then delta H will be positive. It depends whether delta S is negative or positive, and whether T is a high or low value to determine whether delta G will be negative (which would mean the reaction is favorable). If Delta S is negative, that means delta G would never be negative as a positive delta H minus a negative T times Delta S would always be positive. If Delta S is positive, than T would have to be high enough to make T times delta S a greater value than delta H, thus making delta G negative as well.
If a reaction is endothermic then delta H will be positive. It depends whether delta S is negative or positive, and whether T is a high or low value to determine whether delta G will be negative (which would mean the reaction is favorable). If Delta S is negative, that means delta G would never be negative as a positive delta H minus a negative T times Delta S would always be positive. If Delta S is positive, than T would have to be high enough to make T times delta S a greater value than delta H, thus making delta G negative as well.
Return to “Gibbs Free Energy Concepts and Calculations”
Who is online
Users browsing this forum: No registered users and 6 guests