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Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

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BuyFindarrow_forward

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 16, Problem 66E
Textbook Problem
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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,

ΔG=ΔG°+RTln(Q)

Explanation of Solution

The reaction that takes place is,

2H2S(g)+SO2(g)3Srhombic(s)+2H2O(g)

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,

ΔG°=npΔG°(product)nfΔG°(reactant)

Where,

  • 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.

ΔG°=npΔG°(product)nfΔG°(reactant)=[3(0)+2(229){2(34)+(300)}]kJ=90kJ_

Given

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

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

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

Formula

The reaction quotient, is expressed by the formula,

Q=PressureofproductsPressureofreactants

Where,

  • Q is the reaction quotient.

The reaction quotient expression for the given reaction is,

Q=(PH2O)2(PH2S)2(PSO2)

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

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Chapter 16 Solutions

Chemistry: An Atoms First Approach
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Ch. 16 - For the process A(l) A(g), which direction is...Ch. 16 - For a liquid, which would you expect to be larger,...Ch. 16 - Gas A2 reacts with gas B2 to form gas AB at a...Ch. 16 - What types of experiments can be carried out to...Ch. 16 - A friend tells you, Free energy G and pressure P...Ch. 16 - You remember that G is related to RT ln(K) but...Ch. 16 - Predict the sign of S for each of the following...Ch. 16 - Is Ssurr favorable or unfavorable for exothermic...Ch. 16 - At 1 atm, liquid water is heated above 100C. 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