Question

The standard Gibbs free energy change for hydrolysis or pure ATP to pure ADP is -31KJ/mol....

The standard Gibbs free energy change for hydrolysis or pure ATP to pure ADP is -31KJ/mol. The reaction is written ATP = ADP +Pi. What is the Gibbs energy of reaction in an environment at 37 C in which the ATP, ADP, and Pi concentrations are all 1mmol/L or 1 µmol/L?

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Answer #1

Go = -31 kJ /mol

Q = [ADP][Pi]/[ATP]

Q = 1 x 10^-6 (1 x 10^-6) / 1x 10^-6

Q = 1.0 x 10^-6

T = 37 + 273 = 310 K

G = Go + RT lnQ

= -31 + 8.314 x 10^-3 x 310 x ln (1.0 x 10^-6 )

= -66.60 kJ/mol

Gibbs energy of reaction = - 66.60 kJ/mol

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