a critical reaction in the production of energy to do work or drive chemical in

Question

a critical reaction in the production of energy to do work or drive chemical in biological systems is the hydrolysis of adenosine triphosphate, ATP to adenosine diphosphate ADP as described by ATP(aq) + H20(l) ----> ADP(aq) + HPO4^2- (aq) for which change in G rxn = -30.5 kJ/mol at 37.0 celsius and pH 7.0 . Calculate the value of change in G rxn in a biological cell in which ATP=5.0mM [ADP]=0.70mM and [HPO4^2-]=5.0mM change in G rxn=________kJ/mol is the hydrolysis of ATP spontaneous under these conditions? yes or no?

Explanation / Answer

dG = dG0 + RT lnK , T = 37C = 37+273=310 K,

K = [H2PO42-][ADP]/[ATP] = (5)(0.9)/(5) = 0.2 mM = 2 x10^ -4 M ,

RT ln K = 8.314 x310 x ln(2x10^ -4) = -21952 Joules ,

dG = -30500 -21952

= -52452 Joules /mol = -52.452 KJ/mol

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