18. When a mixture of glucose 6-phosphate and fructose 6-phosphate is incubated with the enzyme phosphohexose isomerase, the final mixture contains twice as much glucose 6-phosphate as fructose 6-phosphate. Which one of the following statements is most nearly correct, when applied to the reaction below? (R = 8.315 J/mol.K and T = 298 K)
Glucose 6-phosphate
fructose 6-phosphate
(A)
is +1.7 kJ/mol.
(B)
is-1.7 kJ/mol.
(C)
is incalculably large and negative.
(D)
is incalculably large and positive.
(E)
is zero.
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