h In biological cells the actual AG of a given reaction may differ significantly from the predicted AG Consider a reaction in

Question

h In biological cells the actual AG of a given reaction may differ significantly from the predicted AG Consider a reaction in which reactants A and B are reversibly converted to products C and D When the value of AGis zero at thermodynamic equilibrium the reaction proceeds equally well in forward and reverse But what if the concentrations of products and reactants are not equal To determine the effect of relative concentrations of reactants and products on actual AG we use AG AG 2 303 RTlog C D A B where Ris the gas constant R 8 315 J K mol and Tis the absolute temperature in kelvins 298 K which is equal to 25 C V 1st attempt See Hint If a reaction has a AG close to zero but the actual ratio of products in the cell is very large i e 104 what would the corresponding effect be on actual AG and reaction direction compared to standard conditions AG Choose one or more OA There would be no change in AG relative to AG OB There would be no change in reaction direction OC The reactants would increase relative to AG OD The AGwould be more positive than AG OE The products would increase relative to A G than A

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