8) The following reactions can be coupled to give alanine and oxaloacetate: glut

Question

8) The following reactions can be coupled to give alanine and oxaloacetate: glutamate + pyruvateketoglutarate + alanine glutamate + oxaloacetate ketoglutarate + aspartate 6,03 =-1004J / mol Gos RXN 2 4812./ / mol (a) Write the form of the equilibrium constant for the reaction: Pyruvate + aspartate alanine + oxaloacetate And calculate the numerical value of the equilibrium constant at 30 °C. (b) In the cytoplasm of a certain cell, the components are at the following concentrations: laspartatel = 10-2 M. lpyruvatel = 10-2 M. [alanine] = 10-4 M, aloacetate] = 10-5 M. Calculate G for the reaction in part (a) under these conditions (i.e, 303K). What conclusion can you reach about the direction of the reaction under cytoplasmic conditions? and ox

Explanation / Answer

a) flip the second equation so its G will be 4812 J/mol

add the first and second equations up

This will yield the equation asked about in part a

4812 - 1004 = 3808 J/mol = G

b) G = G0 + RT ln Q

G = 3808 + 8.3145(37+273) ln ((0.1E-3)(10E-6)/(10E-3)^2) = -25866.6 J/mol = -25.9 kJ/mol

The reaction is thermodynamically and energetically favorable under cytoplasmic conditions. The reaction is spontaneous in proceeding fourth under such conditions

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