15 Which of the following reactions could occur spontaneousl

15. Which of the following reactions could occur spontaneously under the standard conditions that specify (G?

(1) ADP + Pi ( ATP (G( = +7.3 kcal/mole
(2) glucose-1-phosphate ( glucose-6-phosphate (G( = –1.7 kcal/mole
(3) glucose + fructose ( sucrose (G( = +5.5 kcal/mole

16. Which of the reactions in question 15 could be coupled to any of the energetically unfavorable reactions in that question to enable them to occur? Why is this possible?

17. Would reaction (3) in question 15 proceed spontaneously under standard conditions if it were catalyzed by an enzyme? Briefly, why or why not?

Solution

15) the equation second can occur spontaneously as the reaction to occur spontaneously the value of G-gibbs energy should be negative.. In second reaction the value is negative hence reactions occur spontaneously..

17) the reaction may occur spontaneously because on adding the enzymes it will lower the activation energy and increase the rate of reaction hence can occur spontaneously..