Coupled Reactions in Biological Systems The Gibbs energy available from the complete combustion of 1 mol of glucose to carbon dioxide and water is (a) Under biological standard conditions, compute the maximum number of moles of ATP that could form from ADP and phosphate if all the energy of combust...

a Maximum moles of ATP formed from the combustion of 1 mol of glucose Given AG2870 kJ mol The maximu ...

Coupled Reactions in Biological Systems. The Gibbs energy available from the complete combustion of 1 mol of

Question:

Coupled Reactions in Biological Systems. The Gibbs energy available from the complete combustion of 1 mol of glucose to carbon dioxide and water is

C6H12O6(aq) + 6 O(g) 6 CO2(g) + 6 HO(1) A,G = -2870 kJ mol-1

(a) Under biological standard conditions, compute the maximum number of moles of ATP that could form from ADP and phosphate if all the energy of combustion of 1 mol of glucose could be utilized.

(b) The actual number of moles of ATP formed by a cell under aerobic conditions (that is, in the presence of oxygen) is about 38. Calculate the efficiency of energy conversion of the cell.

Pco = 0.050 bar; Po = 0.132 bar; [glucose] = 1.0 mg/mL; pH = 7.0; [ATP] = [ADP] = [P] = 0.00010 M.

Calculate Δ_rG° for the conversion of 1 mol ADP to ATP and Δ_rG° for the oxidation of 1 mol glucose under these conditions.

(d) Calculate the efficiency of energy conversion for the cell under the conditions given in part (c).

Compare this efficiency with that of a diesel engine that attains 78% of the theoretical efficiency operating with T_h = 1923 K and T₁ = 873 K. Suggest a reason for your result.

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