O Not set A 50.3/100 O 5/2/2016 10:45 AM Gradebook Print I Calculator Periodic T

Question

O Not set A 50.3/100 O 5/2/2016 10:45 AM Gradebook Print I Calculator Periodic Table Question 6 of 13 Map General Chemistr sity Science Books presented by Sapling Lea Donald McQuarrie. Peter A. Rock. Ethan Gallogly A critical reaction in the production of energy to dowork or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate P, to adenosine diphosphate, ADP, as described by ATP(aq)+ H oli) AD Plaq) HPOX (aq) for which AG 30.5 kJ/mol at 37.0 C and pH 7.0. Calculate the value of AGrxn in a biological ce in which [ATP] 5.0 mM, [ADP1 0.80 mM, and [HPO42 5.0 mM. Number kJ mol AG. ls the hydrolysis of ATP spontaneous under these conditions? yes no Hint G Previous ® Give Up & View Solution 2 Answer Next Ext Check

Explanation / Answer

To calculate the dG (rxn) we use following expression:

dG (rxn) = dGo + RTlnQ

Q= [product]/ [reactant]

= (ADP)*(H2PO4^-)/(ATP)

= 0.80*5.0/5.0

=0.80

And dG 0= -30.5 kJ/ mol or 30500 J , T = 37 C or 310 K

dG (rxn) = dGo + RTlnQ

dG (rxn) = -30500 J/ mol + 8.3145 J/ mol-K*310 K ln 0.80

dG (rxn) = -30500 J/ mol + 2577.495 J/ mol *(-0.223)

dG (rxn) = -30500 J/ mol -575.15 J/mol

dG (rxn) = -31075.15 J/ mol

dG (rxn) = -31.08 kJ/ mol   

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