BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Solutions

Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Determine whether the reactions listed below are entropy-favored or disfavored under standard conditions. Predict how an increase in temperature will affect the value of ΔrG°.

  1. (a) N2(g) + 2 O2(g) → 2 NO2(g)
  2. (b) 2 C(s) + O2(g) → 2 CO(g)
  3. (c) CaO(s) + CO2(g) → CaCO3(s)
  4. (d) 2 NaCl(s) → 2 Na(s) + Cl2(g)

(a)

Interpretation Introduction

Interpretation:

It should be determined that whether the given reaction is entropy favorable and should be identified that how increase in temperature will affect the value of ΔrGo.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔrGo. It is related to entropy and entropy by the following expression,

  ΔGo=ΔHo-TΔSo

Here, ΔHo is the change in enthalpy and ΔSo is the change in entropy.

Entropy for any reaction is expressed as,

  ΔrS°nS°(products)nS°(reactants)

A reaction is said to be entropy-favored if the value of entropy change for reaction is positive.

Explanation

The value of ΔGo, ΔHo and ΔSo is calculated below.

Given:

The Appendix L referred for the values of standard entropies and enthalpies.

N2(g)+2O2(g)2NO2(g)ΔfH°(kJ/mol)0033.1So(J/K×mol)191.56205.07240.04

  ΔrH°=fH°(products)fH°(reactants)=[(2 mol NO2(g)/mol-rxn)ΔfH°[NO2(g)]-[(1 mol N2(g)/mol-rxn)ΔfH°[N2(g)]+(2 mol O2(g)/mol-rxn)ΔfH°[O2(g)]] ] 

Substituting the respective values

  ΔrH°=[(2 mol NO2(g)/mol-rxn)(33.1 kJ/mol)-[(1 mol N2(g)/mol-rxn)(0 kJ/mol)+(2 mol O2(g)/mol-rxn)(0 kJ/mol)] ]=66

(b)

Interpretation Introduction

Interpretation:

It should be determined that whether the given reaction is entropy favorable and should be identified that how increase in temperature will affect the value of ΔrGo.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔrGo. It is related to entropy and entropy by the following expression,

  ΔGo= ΔHo- TΔSo

Here, ΔHo is the change in enthalpy and ΔSo is the change in entropy.

Entropy for any reaction is expressed as,

ΔrS°nS°(products)-nS°(reactants)

A reaction is said to be entropy-favoured if the value of entropy change for reaction is positive.

(c)

Interpretation Introduction

Interpretation:

It should be determined that whether the given reaction is entropy favorable and should be identified that how increase in temperature will affect the value of ΔrGo.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔrGo. It is related to entropy and entropy by the following expression,

ΔGo= ΔHo- TΔSo

Here, ΔHo is the change in enthalpy and ΔSo is the change in entropy.

Entropy for any reaction is expressed as,

ΔrS°nS°(products)-nS°(reactants)

A reaction is said to be entropy-favoured if the value of entropy change for reaction is positive.

(d)

Interpretation Introduction

Interpretation:

It should be determined that whether the given reaction is entropy favorable and should be identified that how increase in temperature will affect the value of ΔrGo.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔrGo. It is related to entropy and entropy by the following expression,

ΔGo= ΔHo- TΔSo

Here, ΔHo is the change in enthalpy and ΔSo is the change in entropy.

Entropy for any reaction is expressed as,

ΔrS°nS°(products)-nS°(reactants)

A reaction is said to be entropy-favoured if the value of entropy change for reaction is positive.

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Chapter 18 Solutions

Show all chapter solutions add

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Water intoxication cannot occur because water is so easily excreted by the body. T F

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

What is the significance of an inversion?

Fundamentals of Physical Geography

What are the strengths and weaknesses of vegetarian diets?

Understanding Nutrition (MindTap Course List)

Why can’t a white dwarf have a mass greater than 1.4 solar masses?

Horizons: Exploring the Universe (MindTap Course List)

What impact has recombinant DNA technology had on genetics and society?

Human Heredity: Principles and Issues (MindTap Course List)

A falling skydiver reaches terminal speed with her parachute closed. After the parachute is opened, what parame...

Physics for Scientists and Engineers, Technology Update (No access codes included)