9th Edition
Steven S. Zumdahl
ISBN: 9781133611097




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

Using data from Appendix 4, calculate ∆G for the reaction

2 H 2 S ( g ) + SO 2 ( g ) 3 S rhombic ( s ) + 2 H 2 O ( g )

for the following conditions at 25°C:

P H 2 S = 1.0 × 10 4 atm P SO 2 = 1.0 × 10 2 atm P H 2 O = 3.0 × 10 2 atm

Interpretation Introduction

Interpretation: The reaction of H2S and SO2 , pressure of each reactant, product and value of temperature of this reaction is given. The value of ΔG is to be calculated by using data from Appendix 4 .

Concept introduction: Reaction quotient, Q , is the measure of concentration or partial pressure of reactants and products of a system before equilibrium point is reached.

The expression for free energy change is,




The reaction that takes place is,


Refer to Appendix 4 .

The value of ΔG°(kJ/mol) for the given reactant and product is,

Molecules ΔG°(kJ/mol)
H2S(g) 34
SO2(g) 300
Srhombic(g) 0
H2O(g) 229

The formula of ΔG° is,



  • np is number of moles of each product.
  • nr is number of moles each reactant.
  • ΔG°(product) is free energy of product at a pressure of 1atm .
  • ΔG°(reactant) is free energy of reactant at a pressure of 1atm .

Substitute all values from the table in the above equation.



Pressure of H2S , PH2S , is 1.00×104atm .

Pressure of SO2 , PSO2 , is 1.00×102atm .

Pressure of H2O , PH2O , is 3.00×102atm .


The reaction quotient, is expressed by the formula,



  • Q is the reaction quotient.

The reaction quotient expression for the given reaction is,


Substitute the values of PH2O,PH2S and PSO2 in the above expression

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