Standard reaction Gibbs energy

K is the thermodynamic equilibrium constant which is only dependent on T, and ArG° is the standard reaction Gibbs energy of the reaction, which can be calculated with... 

The concentrations in Q have arbitrary values. Note that the standard reaction Gibbs energy is given by... 

Table B9 Approximate standard reaction enthalpy and standard reaction Gibbs energy for some selected reactions at standard state T = 25°C, P = 1 atma...

The thermodynamic data in the selected set refer to a temperature of 298.15 K (25.00°C), but they can be recalculated to other temperatures if the corresponding data (enthalpies, entropies, heat capacities) are available [97PU1/RAR]. For example, the temperature dependence of the standard reaction Gibbs energy as a function of the standard reaction entropy at the reference temperature (7o= 298.15 K), and of the heat capacity function is ... 

AG° is the standard reaction Gibbs energy. Then, combining the logarithmic terms. 

Table Cl Approximate Standard Reaction Enthalpy AH", and Standard Reaction Gibbs Energy AG" for Some Seleoted Reactions at Standard State T=25°C, P= 1 atm...

The standard reaction Gibbs energy for the hydrolysis of ATP is+10 kj moT at 298 K. What is the biological standard state value ... 

The biological standard reaction Gibbs energy for the reaction in the preceding brief illustration is —75.5 kJ molThe same calculation illustrated there but with this value gives K =5.3x 10 This value is for... 

Fig. 4.4 The relation between standard reaction Gibbs energy and the equilibrium constant of the reaction.

The standard reaction Gibbs energy is centrai to the discussion of chemical equilibria and the calculation of equilibrium constants. It is also a useful indicator of the energy available from catabolism to drive anabolic processes, such as the synthesis of proteins. 

We have seen that standard reaction Gibbs energy, AjG, is defined as the difference in standard molar Gibbs energies of the products and the reactants weighted by the stoichiometric coefficients, v, in the chemical equation... 

For example, the standard reaction Gibbs energy for reaction A is the difference between the molar Gibbs energies of fructose-6-phosphate and glucose-6-phosphate in solution at 1 mol dm and 1 bar. 

Example 4.4 ) Calculating the standard reaction Gibbs energy of an enzyme-catalyzed reaction... 

Evaluate the standard reaction Gibbs energy at 25°C for the reaction C02(g) + H20(1) —> H2C03(aq) catalyzed by the enzyme carbonic anhydrase in red blood cells. 

Self-test 4.6 ) Use the information in the Resource section to determine the standard reaction Gibbs energy for 3 Ojfg) -> 2 03(g) from standard enthalpies of formation and standard entropies. 

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