13B - Entropy Flashcards
1
Q
What are the units for entropy?
A
J K-1 mol-1
2
Q
Total entropy change for a reaction
A
ΔS(total) = ΔS(system) + ΔS(surroundings)
3
Q
∆S˚system is equal to :
A
∆S˚system = Σ S˚products - ΣS˚reactants
4
Q
∆S˚(surroundings) = ?
A
(−∆H˚(reaction)/T)
- T= Kelvin
- Convert ∆H to J by x 1000
5
Q
Gibbs law for feasibility equation
A
ΔG = ΔH − TΔSsystem
6
Q
For any spontaneous reaction what will ΔG be?
A
- Negative
7
Q
Why are some reactions thermodynamically feasible but they don’t occur spontaneously?
A
- Large activation energy needed (KINTETICALLY STABLE)
- Non standard conditions
