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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 18, Problem 20PS
Textbook Problem
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Using values of ΔfG°, calculate ΔrG° for each of the following reactions at 25 °C. Which are product- favored at equilibrium?

  1. (a) HgS(s) + O2(g) → Hg() + SO2(g)
  2. (b) 2 H2(g) + 3 O2(g) → 2 H2O(g) + 2 SO2(g)
  3. (c) SiCl4(g) + 2 Mg(s) → 2 MgCl2(s) + Si(s)

(a)

Interpretation Introduction

Interpretation:

The value of ΔrG for the given reaction HgS(s)+O2(g)Hg(l)+SO2(g) at 25 °C should be calculated and should be identified that whether the reaction is product-favoured at equilibrium.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔG. It can be calculated in a similar manner as entropy and enthalpy.  The expression for the free energy change is:

  ΔrG°=nΔfG°(products)nΔfG°(reactants)

Explanation of Solution

The standard free energy change for the reaction of HgS(s) and O2(g) is calculated below.

The Appendix L referred for the standard free energy change values.

The standard free energy change value of HgS(s) is 50.6 kJ/mol.

The standard free energy change value of O2(g) is 0 kJ/mol.

The standard free energy change value of SO2(g) is 300.13 kJ/mol.

The standard free energy change value of Hg(l) is 0 kJ/mol.

The balanced chemical equation is,

  HgS(s)+O2(g)Hg(l)+SO2(g)

The expression for the free energy change is:

  ΔrG°=nΔfG°(products)nΔfG°(reactants)=[[(1 mol Hg(l)/mol-rxn)ΔfG°[Hg(l)]+(1 mol SO2(g)/mol-rxn)ΔfG°[SO2(g)]][(1 mol HgS(s)

(b)

Interpretation Introduction

Interpretation:

The value of ΔrG for the given reaction HgS(s)+O2(g)Hg(l)+SO2(g) at 25 °C should be calculated and should be identified that whether the reaction is product-favoured at equilibrium.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔG. It can be calculated in a similar manner as entropy and enthalpy.  The expression for the free energy change is:

  ΔrG°=nΔfG°(products)nΔfG°(reactants)

(c)

Interpretation Introduction

Interpretation:

The value of ΔrG for the given reaction SiCl4(g)+2Mg(s)2MgCl2(s)+Si(s) at 25 °C should be calculated and should be identified that whether the reaction is product-favoured at equilibrium.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔG. It can be calculated in a similar manner as entropy and enthalpy.  The expression for the free energy change is:

  ΔrG°=nΔfG°(products)nΔfG°(reactants)

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Chapter 18 Solutions

Chemistry & Chemical Reactivity
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Ch. 18.4 - Without looking up their standard entropies in...Ch. 18.4 - Without doing any calculations, predict the sign...Ch. 18.4 - Calculate rS for the following reaction at 25 C....Ch. 18.5 - Based on rH and rS, predict the spontaneity of the...Ch. 18.5 - Calculate rS for the following reaction at 25 C...Ch. 18.5 - Calculate S(universe) for the following reaction...Ch. 18.5 - 3. If rH° = +467.9 kJ/mol-rxn and rS° = +560.7 J/K...Ch. 18.6 - For a reaction to be spontaneous, rG will be...Ch. 18.6 - A reaction for which rG 0 is (a) product-favored...Ch. 18.7 - Using values of fH and S to find rH and rS,...Ch. 18.7 - Calculate the standard free energy change for the...Ch. 18.7 - Oxygen was first prepared by Joseph Priestley...Ch. 18.7 - Determine the value of rG for the reaction C(s) +...Ch. 18.7 - Determine the value of the equilibrium constant,...Ch. 18.7 - Nitrogen and oxygen can react to form nitrogen...Ch. 18.7 - 1. Given that H° = −2219 kJ/mol-rxn and that rS° =...Ch. 18.7 - 2. Using values of rG°, determine the value of rG°...Ch. 18.7 - 3. The value of Kp for the following reaction at...Ch. 18.7 - Consider the hydrolysis reactions of creatine...Ch. 18.7 - Assume the reaction A(aq) + B(aq) C(aq) +...Ch. 18.A - The decomposition of diamond to graphite...Ch. 18.A - It has been demonstrated that buckminsterfullerene...Ch. 18 - Which substance has the higher entropy? (a) dry...Ch. 18 - Which substance has the higher entropy? 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