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# Free Energy of Fructose-6-Phosphate and Glucose-6-Phosphate

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Fructose-1,6-diphosphate can be converted to glucose-1-phosphate by three successive reactions:

Fructose 1,6 diphosphate + H20 ---> fructose-6-phosphate + Pi Keq= 607

Fructose-6-phosphate ---> glucose-6-phosphate G°= -410 cal/mol

Glucose-6-phosphate --->glucose-1-phosphate G°= 1750 cal/mol

Assuming 1 atm pressure, 25°C, R = 1.99cal/mol x deg C. From the above info what is the Keq and the deltaG° for the overall reaction?

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https://brainmass.com/biology/biological-chemistry/free-energy-fructose-phosphate-glucose-phosphate-148560

#### Solution Preview

fructose 1,6 diphosphate can be converted to glucose-1-phosphate by three successive reactions:

Fructose 1,6 diphosphate + H20 ---> fructose-6-phosphate + Pi Keq= 6.07 x 10^2

Fructose-6-phosphate ---> glucose-6-phosphate G°= -410 cal/mol

Glucose-6-phosphate --->glucose-1-phosphate G°= 1750 ...

#### Solution Summary

A free energy calculation is shown in fine detail. Free energy of Fructose-6-Phosphate and Glucose-6-Phosphate is examined.

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## Free Energy and Thermodynamics

1-Consider the reaction: I 2 (g)+Cl 2 (g)⇌2ICl(g). K p = 81.9 at 25 ∘ C.
Calculate ΔG rxn for the reaction at 25 ∘ C under each condition:

Part A: standard conditions.Express your answer using one decimal place.
Part B: at equilibrium
Part C: P ICl = 2.55atm ; P I 2 = 0.315atm ; P Cl 2 = 0.219atm .Express your answer using one decimal place.

2-Consider the following isomerization reactions of some simple sugars and values for their standard Gibbs free energy ΔG ∘:
reaction A: glucose-1-phosphate⟶ glucose-6-phosphate, ΔG ∘ =−7.28 kJ/mol
reaction B: fructose-6-phosphate ⟶, glucose-6-phosphate, ΔG =−1.67 kJ/mol

Part A
Calculate ΔG ∘ for the isomerization of glucose-1-phosphate to fructose-6-phosphate.
Express your answer with the appropriate units.

3-In photosynthesis, plants form glucose (C 6 H 12 O 6 ) and oxygen from carbon dioxide and water.
Part A :Write a balanced equation for photosynthesis.
Part B:Calculate ΔH ∘ rxn at 15 ∘ C .
Part C Calculate ΔS ∘ rxn at 15 ∘ C .
Part D:Calculate ΔG ∘ rxn at 15 ∘ C .
Part E :Is photosynthesis spontaneous?

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