
(a)
Interpretation:
For the hydrolysis of ATP, the equilibrium constant K should be founded at 298 K.
Concept introduction:
Adenosine triphosphate ATP: The main job of ATP is to store energy and release it when cell is in need of energy.
Free energy changeΔG: change in the free energy takes place while reactant converts to product where both are in standard state. It depends on the equilibrium constant K,
ΔG = ΔGo+ RT ln (K) (or)ΔGo=−RT ln (K)
Where,
T is the temperature
ΔG is the free energy
ΔG0 is standard free energy values.
(a)

Answer to Problem 20.99P
The hydrolysis of ATP is equilbrium constant value is K=2.22×105_.
Explanation of Solution
The chemical equation for hydrolysis of ATP is,
(1). ATP4−(aq) + H2O(l) ⇌ ADP3−(aq) + HPO2−4(aq) + H+(aq) ΔGo=−30.5 kJ
Free energy equation is,
ΔG=0= ΔGo+ RT ln (K)ΔGo=− RT ln (K)−−−−−−−[1]ΔGo=-30.5 kJR= 8.314 J/mol×KT= 273 K+25 K =298 K.
Consider the reaction (1) hydrolysis of ATP
Calculation for equilibrium constant K
We know that equilibrium equation,
ΔGorxn =−RT ln (K)
Rearrange the above equation,
ln K = −ΔGoRT= (−30.5 kJ/mol−(8.314 J/mol⋅K)(298 K))(103J1 kJ)ln K = 12.3104K= e12.3104K= 2.2199×105 = 2.22×105.
The hydrolysis of ATP is equilbrium constant value is K=2.22×105_.
(b)
Interpretation:
For the dehydration condensation to from glucose phosphate, the equilibrium constant K should be calculated at 298 K.
Concept introduction:
Free energy change: The free energy change of a reaction is given by the subtraction of free energy changes of reactants from free energy changes of reactants.
ΔG =∑nΔGf° (products)-∑mΔGf° (reactants)
Free energy changeΔG: change in the free energy takes place while reactant converts to product where both are in standard state. It depends on the equilibrium constant K
ΔG = ΔGo+ RT ln (K) (or)ΔGo=−RT ln (K)
Where,
T is the temperature
ΔG is the free energy
ΔG0 is standard free energy values.
(b)

Answer to Problem 20.99P
The ATPs, dehydration equilbrium is K=3.81×10-3_.
Explanation of Solution
The chemical equation for dehydration of ATP is,
(2). Glucose+ HPO2−4(aq) ⇌ [Glucose phosphate]− + H2O(l) ΔGo= 13.8 kJ
Free energy equation is,
ΔG=0= ΔGo+ RT ln (K)ΔGo=− RT ln (K)−−−−−−−[1]ΔGo= 13.8 kJR= 8.314 J/mol×KT= 273 K+25 K =298 K.
Consider the reaction (2) dehydration of ATP
Calculation for equilibrium constant K
We know that equilibrium equation,
ΔGorxn =−RT ln (K)
Rearrange the above equation,
ln K = −ΔGoRT= (13.8 kJ/mol−(8.314 J/mol⋅K)(298 K))(103J1 kJ)ln K = −5.569969K= e−5.569969K= 3.8105985×10−3 K= 3.81×10-3.
Hence, the ATPs, dehydration equilbrium is K=3.81×10-3_.
(c)
Interpretation:
For the coupled reaction between ATP and glucose
Concept introduction:
Free energy change: The free energy change of a reaction is given by the subtraction of free energy changes of reactants from free energy changes of reactants.
ΔG =∑nΔGf° (products)-∑mΔGf° (reactants)
Free energy changeΔG: change in the free energy takes place while reactant converts to product where both are in standard state. It depends on the equilibrium constant K
ΔG = ΔGo+ RT ln (K) (or)ΔGo=−RT ln (K)
Where,
T is the temperature
ΔG is the free energy
ΔG0 is standard free energy values.
(c)

Answer to Problem 20.99P
Given coupled reaction equilbrium value is K=8.46×102_.
Explanation of Solution
The chemical equation for dehydration of ATP is,
(3). Glucose + ATP4−(aq) ⇌ [Glucose phosphate]− + ADP3−(aq) ΔGo= −16.7 kJ
Free energy equation is,
ΔG=0= ΔGo+ RT ln (K)ΔGo=− RT ln (K)ΔGo=−16.7 kJ/molΔGo= -16.7 kJR= 8.314 J/mol×KT= 273 K+25 K =298 K.
Consider the coupled (3) reaction between ATP and glucose is,
The equilibrium equation,
ΔGorxn =−RT ln (K)
Rearrange the above equation to calculate K
ln K = ΔGo-RT= (−16.7 kJ/mol−(8.314 J/mol⋅K)(298 K))(103J1 kJ)ln K =6.74047K= e6.74047= 8.45958×102= 8.46×102.
Hence, the coupled reaction equilbrium value is K=8.46×102_.
(d)
Interpretation:
Identify the change in K when T changes from 20oC to 37oC in each cases a,b and c
Concept introduction:
Free energy change: The free energy change of a reaction is given by the subtraction of free energy changes of reactants from free energy changes of reactants.
ΔG =∑nΔGf° (products)-∑mΔGf° (reactants)
Free energy changeΔG: change in the free energy takes place while reactant converts to product where both are in standard state. It depends on the equilibrium constant K
ΔG = ΔGo+ RT ln (K) (or)ΔGo=−RT ln (K)
Where,
T is the temperature
ΔG is the free energy
ΔG0 is standard free energy values.
(d)

Answer to Problem 20.99P
Given each reactions equilibrium changes has K= 1.38×105, 4.73×10-3 and 6.52×102.
Explanation of Solution
The chemical equation of ATP is,
(1). ATP4−(aq) + H2O(l) ⇌ ADP3−(aq) + HPO2−4(aq) + H+(aq) ΔGo=−30.5 kJ(2). Glucose+ HPO2−4(aq) ⇌ [Glucose phosphate]− + H2O(l) ΔGo= 13.8 kJ(3). Glucose + ATP4−(aq) ⇌ [Glucose phosphate]− + ADP3−(aq) ΔGo= −16.7 kJ
The temperature changes from 20oC to 37oCeach of Kchanges.
The calculations at the new temperature T= (273 + 37 =310.0 K)
The equilibrium equation,
ΔGorxn =−RT ln (K)
Case-1
ln K = ΔGo-RT= (−30.5 kJ/mol−(8.314 J/mol⋅K)( 310 K))(103J1 kJ)ln K = 11.8339K= e11.8339= 1.37847×105= 1.38×105.
Case-2
ln K = ΔGo-RT= (13.8 kJ/mol−(8.314 J/mol⋅K)( 310 K))(103J1 kJ)ln K =−5.3543576K= e−5.3543576= 4.7275×10−3= 4.73×10-3.
Case-3
ln K = ΔGo-RT= (−16.7 kJ/mol−(8.314 J/mol⋅K)( 310 K))(103J1 kJ)ln K =6.4795K= e6.4795= 6.51645×102= 6.52×102.
Hence, the each cases equilibrium changes has K= 1.38×105, 4.73×10-3 and 6.52×102.
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Chapter 20 Solutions
Student Study Guide for Silberberg Chemistry: The Molecular Nature of Matter and Change
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