The free energy requirement for the synthesis of 1 mol of ATP under steady state concentrations of ATP, ADP, and P i Introduction : The phosphorylation of ADP for the synthesis of ATP in the presence of sunlight is called as photophosphorylation. In living organisms, energy can be obtained either directly from sunlight or by the use of redox reaction .

Explanation:

The steady state concentration of ATP, ADP, and P_i for calculating the free energy requirement for synthesis of 1 mol ATP is given as: ATP = 120.0 μM, ADP = 6.0 μM, and Pi = 700.0 μM. Thus, free energy requirement for synthesis of 1 mol ATP can be calculated by the formula given below:

ΔG = ΔG′° + RT ln[ATP][ADP + Pi]

In the given equation, ΔG determines the free energy, and ΔG′° has standard value 30.5 kJ/mol for the reaction to synthesize the ATP from ADP, and P_i, R and T are constants whose value is R = 8.315 J/molK and T = 25 °C/298 K

Now, from above equation, ΔG can be calculated as:

= 30.5kJ/mol + (2.478 kJ/mol) ln[120μM][6μM × 700μM]= 30