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2-phosphoglycerate(2PG) is converted to phosphoenolpyruvate (PEP) by the enzyme enolase. The standard free energy change(deltaGo’) for...

2-phosphoglycerate(2PG) is converted to phosphoenolpyruvate (PEP) by the enzyme enolase. The standard free energy change(deltaGo’) for this reaction is +1.7 kJ/mol. If the cellular concentrations are 2PG = 0.5 mM and PEP = 0.1 mM, what is the free energy change at 37 oC for the reaction 2PG ↔ PEP?

5.8 kJ/mol

-5.8 kJ/mol

+2.4 kJ/mol

-2.4 kJ/mol

-4146.4 kJ/mol

+4146.4 kJ/mol

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Answer #1

G    = G0 + RTlnK

G0 = 1.7Kj/mole = 1700J/mole

R        = 8.314J/mole-K

T       = 37C0 = 37+273 = 310K

G   = 1700+ 8.314*310ln0.1/0.5

           = 1700+8.314*310*-1.6094

           = -2447.97J/mole = -2.44797Kj/mole

         = -2.4 kJ/mol >>>> answer

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