Energetics

Question 1

Equation for ∆G

Answer 1

∆G=∆G°’+1.36 log〖P/S〗

Note: This is for 25 degress C and concentrations must be in molar units for product and substrate. ∆G will become more negative as the concentration of substrate increases.

Question 2

Equation for ∆G°’

Answer 2

∆G°’= -1.36 log〖K’eq 〗

Note: K’eq is the ratio of products to substrates at equilibrium.

Question 3

Equation for ∆G°’_T

Answer 3

∆G°’_T = ∆G°’₁+ ∆G°’₂

Notes: This is used for sequential reactions. This same relationship can be used to calculate ∆G_Tgiven ∆G of each step.

Question 4

Equation for ΔE°’

Answer 4

ΔE°’= E°’ (e- acceptor) -ΔE°’(e- donor)

Note: Use to calculate voltage difference between two half reactions under standard conditions.

Question 5

Equation for ΔE

Answer 5

ΔE= ΔE°’ + (0.059/n) log (S/P)

Note: Concentrations should be in molar units

Question 6

Equation for ΔG

Answer 6

ΔG= -nFΔE

Note: n is the number of electrons transferred, F=23.063 kcal/mol*volt. Can use this same equation for standard free energy chabnge with the standard voltage change.