When a mixture of 3-phosphoglycerate and 2-phosphoglycerate is incubated at 25°C in the presence of the enzyme  phosphoglycerate mutase (which catalyzes the intervconversion of the two substances) until equilibrium is reached,  the final mixture contains 6 times as much 2-phosphoglycerate as 3-phosphoglycerate.  Which of the following statements is most nearly correct when applied to the reaction shown below: 3-phosphoglycerate ------> 2-phosphoglycerate (R=8.315 J/mole.K)   A. △G°' = +12.7 kJ/mole   B. △G°' = 0   C. △G°'  is incalculably large and positive   D. △G°' = -4.44 kJ/mole   E. △G°'  cannot be calculated from the information gven

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