GIBBS ENERGY AND THERMODYNAMIC Flashcards
1
Q
Entropy (s)
A
Determines spontaneity of a reaction
2
Q
Entropy formulas (3)
A
𝛥S = q/T (J/K)
𝛥S = 𝛥H/T
𝛥S = Sfinal - Sinital
3
Q
𝛥Surr formula (2)
A
𝛥Surr = -Hsys/T
𝛥Surr = qsurr/T
4
Q
Gibbs energy
A
Available energy that can be used in a chemical reaction
5
Q
Gibbs energy formulas (3)
A
𝛥G° = 𝛥H-T𝛥S
𝛥G = 𝛥G°+RT lnQ
𝛥G° = RTlnK
6
Q
Entropy trend based on physical states
A
Gas > Liquid > Solid
7
Q
Gibbs energy trend (3)
A
- G<0 spontaneous
- G>0 non spontaneous
- G= 0 at equilibrium
8
Q
Determine temperature formula
A
T = 𝛥rH/𝛥rS
9
Q
What does the ° mean on G, S, H
A
Means it’s at 25 °C (298K)
10
Q
H° unit
A
kj/mol
11
Q
S° unit
A
J/mol K
12
Q
𝛥fG° rule (3)
A
- Standard Gibbs energy of formation
- Pure element is always 0
𝛥fG° = Σ𝛥fG°prod- Σ𝛥fG°reac
13
Q
Can non spontaneous reactions be spontaneous
A
Yes by adding together
14
Q
Slope formula
A
-𝛥H°/R
15
Q
y int formula
A
𝛥S°/R
