The value of Δ G ° ' ΔG°′ for the conversion of 3-phosphoglycerate to 2-phosphoglycerate (2PG) is + 4.40 kJ/mol +4.40 kJ/mol . If the concentration of 3-phosphoglycerate at equilibrium is 2.15 mM 2.15 mM , what is the concentration of 2-phosphoglycerate? Assume a temperature of 25.0 ° C 25.0°C .

The concentration of 2-phosphoglycerate = 0.344 mM

Explanation:

ΔG°  for the conversion of 3-phosphoglycerate to 2-phosphoglycerate (2PG) is + 4.40 kJ/mole.

            We know ΔG° =

   where R = Universal gas constant = 8.314 x 10⁻³ kj.mole⁻¹. k⁻¹

                               T = Kelvin temperature = 25 + 273 = 298 K

                            ⇒   log K =

                            ⇒   log K = - 0.77

                            ⇒        K = 0.16

             3-phosphoglycerate → 2-phosphoglycerate

            Where 'K' is equilibrium constant

             ⇒ x = 0.16 x 2.15 x 10⁻³

             ⇒ x = 0.000344 molar or 0.344 mM at 25°C

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