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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Cells use the hydrolysis of adenosine triphosphate, abbreviated as ATP, as a source of energy. Symbolically, this reaction can be written as

ATP ( a q ) + H 2 O ( l ) ADP ( a q ) + H 2 PO 4 ( a q )

where ADP represents adenosine diphosphate. For this reaction, ∆G° =−30.5 kJ/mol.

a. Calculate K at 25°C.

b. If all the free energy from the metabolism of glucose

C 6 H 12 O 6 ( s ) + 6 O 2 ( g ) 6 CO 2 ( g ) + 6 H 2 O ( l )

goes into forming ATP from ADP, how many ATP molecules can be produced for every molecule of glucose?

 (a)

Interpretation Introduction

Interpretation: The reaction of hydrolysis of adenosine and its ΔG° value is given. The value of K is to be calculated at given temperature. Another reaction of breakdown of glucose is given. The number of ATP molecules produced from every molecule of glucose is to be calculated.

Concept introduction: Equilibrium constant, K , is defined as the ratio of the concentration of products to that of the reactants at equilibrium. If a given reaction is at equilibrium, then the free energy change will be,

ΔG=0Q=K

The expression for free energy change is,

ΔG°=RTln(K)

Explanation

Explanation

Given

The value ΔG° for the given reaction is 30.5kJ/mol .

Given temperature is 25°C .

The conversion of kilo-joule (kJ) into joule (J) is done as,

1kJ=103J

Hence,

The conversion of 30.5kJ into joule is,

30.5kJ=(30.5×103)J=30.5×103J

The conversion of degree Celsius (°C) into Kelvin (K) is done as,

T(K)=T(°C)+273

Hence,

The conversion of 25°C into Kelvin is,

T(K)=T(°C)+273T(K)=(25+273)K=298K

 (b)

Interpretation Introduction

Interpretation: The reaction of hydrolysis of adenosine and its ΔG° value is given. The value of K is to be calculated at given temperature. Another reaction of breakdown of glucose is given. The number of ATP molecules produced from every molecule of glucose is to be calculated.

Concept introduction: Equilibrium constant, K , is defined as the ratio of the concentration of products to that of the reactants at equilibrium. If a given reaction is at equilibrium, then the free energy change will be,

ΔG=0Q=K

The expression for free energy change is,

ΔG°=RTln(K)

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