Entropy & Spontaneity - Gibbs free energy Flashcards
1
Q
What determines the feasibility of a reaction?
A
The feasibility of a reaction is determined by two factors:
* Enthalpy change
* Entropy change
2
Q
What is the Gibbs free energy denoted as?
A
G
3
Q
What is the Gibbs equation?
A
ΔGꝋ = ΔHreactionꝋ – TΔSsystemꝋ
4
Q
What are the units of ΔGꝋ?
A
kJ mol–1
5
Q
What are the units of ΔHreactionꝋ?
A
kJ mol–1
6
Q
What are the units of temperature (T) in the Gibbs equation?
A
K
7
Q
What are the units of ΔSsystemꝋ?
A
J K-1 mol–1 (must be converted to kJ K–1 mol–1 by dividing by 1000)
8
Q
How can you calculate ΔGꝋ?
A
There are two ways to calculate ΔGꝋ:
* From the Gibbs equation using ΔHꋋ and ΔSꋋ values
* From ΔGꋋ values of all the substances present
