The free-energy change of ATP hydrolysis to ADP inside the cell is about -50 kJ/mole. The standard free-energy change for the same reaction is about -30 kJ/mole. This necessitates that [ATP] inside the cell be …

Question

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The equilibrium constant for the hydrolysis reaction (not considering water) is:
Kₑq = [ADP]ₑq × [Pᵢ]ₑq / [ATP]ₑq
ΔG will have a greater negative value than ΔG° if and only if concentrations deviate from Kₑq such that [ADP] × [Pᵢ] / [ATP] < Kₑq.

The Free-Energy Change of ATP Hydrolysis to ADP Inside the Cell