6. Metabolism is the chemical process that involves the extraction of chemical e

Question

6. Metabolism is the chemical process that involves the extraction of chemical energy from sugars and fats. One such reaction is:

C6H12O6 + 6O2 6CO2 + 6H2O, Go = -2870 kJ
Some of this energy may be used to synthesize energy transport molecules, the most important of which is adenosine triphosphate (ATP).

ADP+H3PO4 ATP+H2O,Go=+30.6kJ
a) How many ATP could be synthesized from the combustion of 1.0 mol of glucose?
b) Under normal physiological conditions, only 36 ATP molecules are produced. What percent of the energy is used and what percent is wasted? Where does the waste go?

Another biochemical reaction that produces ATP involves the conversion of acetylphosphate (CH3CO2PO3H2) to acetic acid and phosphoric acid.

CH3CO2PO3H2 + H2O HC2H3O2 + H3PO4, Go = -46.9 kJ
c) Write the balanced chemical equation that shows the coupling of the acetylphosphate hydrolysis reaction and the ATP synthesis reaction. Determine the free energy change.

This questions has part a,b, & c that needs to be answered. If you could give detailed answer please thank you.

Explanation / Answer

a)

consider the given reactions

C6H1206 + 602 ---> 6 C02 + 6 H20   dGo = -2870 kJ

ADP + H3P04 --> ATP + H20   dGo = 30.6 kJ

so

numer of ATP = 2870 / 30.6

number of ATP = 94

so

94 ATP could be synthesized from the combustion of 1 mol of glucose

b)

so

percent waste = ( 94-36) x 100 / 94

percent waste = 61.7

so

the 61.7 percent is wasted

c)

consider the given reaction

CH3CO2PO3H2 + H20 ---> HC2H302 + H3P04

ADP + H3P04 ---> ATP + H20

add both the reactions

we get

CH3CO2PO3H2 + ADP ---> HC2H302 + ATP

as we added botht the reaction

free energy change is the sum of free energies

so

for the coupled reaction

dGo = 30.6 + (-46.9)

dGo = -16.3 kJ

so

the free energy change is -16.3 kJ

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