General Chemistry
General Chemistry
7th Edition
ISBN: 9780073402758
Author: Chang, Raymond/ Goldsby
Publisher: McGraw-Hill College
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Chapter 9, Problem 9.73QP

(a)

Interpretation Introduction

Interpretation:

Energy change for the given reaction has to be calculated using ionization energy and electron affinity values.

Concept Introduction:

Ionization energy is defined as the energy required removing the valence electron of an atom when it is in gaseous state. In periodic table ionization energy of elements decreases down the column or group and increases across the row or period as it is inversely proportional to the atomic size.

Electron affinity is defined as the energy released when an electron is added (gained by an atom) to the atom in its gaseous state forming negative ion. In periodic table electron affinity of elements decreases down the column or group and increases across the row or period as it is inversely proportional to the atomic size.

Hess’s law is applied to calculate the enthalpy changes in a reaction. According to Hess’s law – “The overall enthalpy change of a reaction is equal to the sum of the enthalpy changes involving in each and every individual steps present in the reaction.” Thus if a reaction involves ‘n’ steps then enthalpy change ΔH° of the reaction is,

ΔH°= ΔH1°+ΔH2°+ΔH3°....+ΔHn°

(a)

Expert Solution
Check Mark

Answer to Problem 9.73QP

The energy change for the given reaction is calculated as 225 kJ/mol.

Explanation of Solution

The given reaction is,

Li(g)+I(g)Li(g)++I(g)

With reference to table 8.2 and 8.3,

electronaffinityofI =295kJ/molionizationenergyofLi =520kJ/mol

Energy is released while accepting an electron. Hence the value of electron affinity value carries negative sign as it is energy releasing process.

The given reaction occurs in two steps as shown below. The corresponding change in enthalpy of the reaction is as follows,

Li(g) Li(g)++e ΔH° = 520 kJ/molI(g)+eI(g) ΔH° = -295 kJ/mol

In accordance with Hess’s law energy change of the given reaction is equal to the sum of energy changes in the above reaction.  Therefore,

Li(g) Li(g)++e ΔH°= 520 kJ/molI(g)+eI(g) ΔH° = -295 kJ/molLi(g)+I(g)Li(g)++I(g) ΔH° = +225 kJ/mol

(b)

Interpretation Introduction

Interpretation:

Energy change for the given reaction has to be calculated using ionization energy and electron affinity values.

Concept Introduction:

Ionization energy is defined as the energy required to remove the valence electron of an atom when it is in gaseous state.  In periodic table ionization energy of elements decreases down the column or group and increases across the row or period as it is inversely proportional to the atomic size.

Electron affinity is defined as the energy released when an electron is added (gained by an atom) to the atom in its gaseous state forming negative ion.  In periodic table electron affinity of elements decreases down the column or group and increases across the row or period as it is inversely proportional to the atomic size.

Hess’s law is applied to calculate the enthalpy changes in a reaction.  According to Hess’s law – “The overall enthalpy change of a reaction is equal to the sum of the enthalpy changes involving in each and every individual steps present in the reaction.”  Thus if a reaction involves ‘n’ steps then enthalpy change ΔH° of the reaction is,

ΔH°= ΔH1°+ΔH2°+ΔH3°....+ΔHn°

(b)

Expert Solution
Check Mark

Answer to Problem 9.73QP

The energy change for the given reaction is calculated as 167.9 kJ/mol.

Explanation of Solution

The given reaction is,

Na(g)+F(g)Na(g)++F(g)

With reference to table 8.2 and 8.3,

electronaffinityofF =328kJ/molionizationenergyofNa =495.9kJ/mol

Energy is released while accepting an electron. Hence the value of electron affinity value carries negative sign as it is energy releasing process.

The given reaction occurs in two steps as shown below. The corresponding change in enthalpy of the reaction is as follows,

Na(g) Na(g)++e ΔH° = 495.9 kJ/molF(g)+eF(g) ΔH° = -328 kJ/mol

In accordance with Hess’s law energy change of the given reaction is equal to the sum of energy changes in the above reaction. Therefore,

Na(g) Na(g)++e ΔH° = 495.9 kJ/molF(g)+eF(g) ΔH° = -328 kJ/molNa(g)+F(g)Na(g)++F(g) ΔH° = 167.9 kJ/mol

(c)

Interpretation Introduction

Interpretation:

Energy change for the given reaction has to be calculated using ionization energy and electron affinity values.

Concept Introduction:

Ionization energy is defined as the energy required to remove the valence electron of an atom when it is in gaseous state.  In periodic table ionization energy of elements decreases down the column or group and increases across the row or period as it is inversely proportional to the atomic size.

Electron affinity is defined as the energy released when an electron is added (gained by an atom) to the atom in its gaseous state forming negative ion.  In periodic table electron affinity of elements decreases down the column or group and increases across the row or period as it is inversely proportional to the atomic size.

Hess’s law is applied to calculate the enthalpy changes in a reaction.  According to Hess’s law – “The overall enthalpy change of a reaction is equal to the sum of the enthalpy changes involving in each and every individual steps in the reaction.”  Thus if a reaction involves ‘n’ steps then enthalpy change ΔH° of the reaction is,

ΔH°= ΔH1°+ΔH2°+ΔH3°....+ΔHn°

(c)

Expert Solution
Check Mark

Answer to Problem 9.73QP

The energy change for the given reaction is calculated as 69.7 kJ/mol.

Explanation of Solution

The given reaction is,

K(g)+Cl(g)K(g)++Cl(g)

With reference to table 8.2 and 8.3,

electronaffinityofCl =349kJ/molionizationenergyofK =418.7kJ/mol

Energy is released while accepting an electron. Hence the value of electron affinity value carries negative sign as it is energy releasing process.

The given reaction occurs in two steps as shown below. The corresponding change in enthalpy of the reaction is as follows,

K(g) K(g)++e ΔH° = 418.7 kJ/molCl(g)+eCl(g) ΔH° = -349 kJ/mol

In accordance with Hess’s law energy change of the given reaction is equal to the sum of energy changes in the above reaction.  Therefore,

K(g) K(g)++e ΔH° = 418.7 kJ/molCl(g)+eCl(g) ΔH° = -349 kJ/molK(g)+Cl(g)K(g)++Cl(g) ΔH° = 69.7 kJ/mol

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Chapter 9 Solutions

General Chemistry

Ch. 9.6 - Prob. 1RCCh. 9.7 - Prob. 1PECh. 9.7 - Prob. 2PECh. 9.7 - Prob. 1RCCh. 9.8 - Prob. 1PECh. 9.8 - Prob. 1RCCh. 9.9 - Practice Exercise Draw the Lewis structure for...Ch. 9.9 - Prob. 2PECh. 9.9 - Prob. 3PECh. 9.9 - Prob. 4PECh. 9.9 - Prob. 1RCCh. 9.10 - Prob. 1PECh. 9.10 - Prob. 1RCCh. 9 - Prob. 9.1QPCh. 9 - 9.2 Use the second member of each group from Group...Ch. 9 - Prob. 9.3QPCh. 9 - Prob. 9.4QPCh. 9 - Prob. 9.5QPCh. 9 - Prob. 9.6QPCh. 9 - Prob. 9.7QPCh. 9 - Prob. 9.8QPCh. 9 - Prob. 9.9QPCh. 9 - Prob. 9.10QPCh. 9 - Prob. 9.11QPCh. 9 - Prob. 9.13QPCh. 9 - Prob. 9.14QPCh. 9 - Prob. 9.15QPCh. 9 - Prob. 9.16QPCh. 9 - Prob. 9.17QPCh. 9 - Prob. 9.18QPCh. 9 - Prob. 9.19QPCh. 9 - Prob. 9.20QPCh. 9 - Prob. 9.21QPCh. 9 - 9.22 Explain how the lattice energy of an ionic...Ch. 9 - Prob. 9.23QPCh. 9 - Prob. 9.24QPCh. 9 - Prob. 9.25QPCh. 9 - Prob. 9.26QPCh. 9 - Prob. 9.27QPCh. 9 - Prob. 9.28QPCh. 9 - Prob. 9.29QPCh. 9 - Prob. 9.30QPCh. 9 - Prob. 9.31QPCh. 9 - Prob. 9.33QPCh. 9 - 9.34 Arrange these bonds in order of increasing...Ch. 9 - Prob. 9.35QPCh. 9 - Prob. 9.36QPCh. 9 - Prob. 9.37QPCh. 9 - Prob. 9.38QPCh. 9 - Prob. 9.39QPCh. 9 - Prob. 9.40QPCh. 9 - Prob. 9.41QPCh. 9 - Prob. 9.42QPCh. 9 - Prob. 9.43QPCh. 9 - Prob. 9.44QPCh. 9 - Prob. 9.45QPCh. 9 - Prob. 9.46QPCh. 9 - Prob. 9.47QPCh. 9 - Prob. 9.48QPCh. 9 - Prob. 9.49QPCh. 9 - Prob. 9.50QPCh. 9 - Prob. 9.51QPCh. 9 - Prob. 9.52QPCh. 9 - Prob. 9.53QPCh. 9 - Prob. 9.54QPCh. 9 - Prob. 9.55QPCh. 9 - Prob. 9.56QPCh. 9 - Prob. 9.57QPCh. 9 - Prob. 9.58QPCh. 9 - Prob. 9.59QPCh. 9 - Prob. 9.60QPCh. 9 - Prob. 9.61QPCh. 9 - Prob. 9.62QPCh. 9 - Prob. 9.63QPCh. 9 - Prob. 9.64QPCh. 9 - Prob. 9.65QPCh. 9 - Prob. 9.66QPCh. 9 - Prob. 9.67QPCh. 9 - Prob. 9.68QPCh. 9 - Prob. 9.69QPCh. 9 - Prob. 9.70QPCh. 9 - Prob. 9.71QPCh. 9 - Prob. 9.72QPCh. 9 - Prob. 9.73QPCh. 9 - Prob. 9.74QPCh. 9 - Prob. 9.75QPCh. 9 - Prob. 9.76QPCh. 9 - Prob. 9.77QPCh. 9 - Prob. 9.78QPCh. 9 - Prob. 9.79QPCh. 9 - Prob. 9.80QPCh. 9 - 9.81 Draw reasonable resonance structures for...Ch. 9 - Prob. 9.82QPCh. 9 - Prob. 9.83QPCh. 9 - Prob. 9.84QPCh. 9 - Prob. 9.85QPCh. 9 - Prob. 9.86QPCh. 9 - Prob. 9.87QPCh. 9 - Prob. 9.88QPCh. 9 - Prob. 9.89QPCh. 9 - Prob. 9.90QPCh. 9 - Prob. 9.91QPCh. 9 - Prob. 9.92QPCh. 9 - Prob. 9.93QPCh. 9 - Prob. 9.94QPCh. 9 - Prob. 9.95QPCh. 9 - Prob. 9.96QPCh. 9 - Prob. 9.97QPCh. 9 - Prob. 9.98QPCh. 9 - Prob. 9.99QPCh. 9 - Prob. 9.100QPCh. 9 - Prob. 9.101QPCh. 9 - Prob. 9.102QPCh. 9 - Prob. 9.103QPCh. 9 - Prob. 9.104QPCh. 9 - Prob. 9.105QPCh. 9 - Prob. 9.106QPCh. 9 - Prob. 9.107QPCh. 9 - Prob. 9.108QPCh. 9 - 9.109 Among the common inhaled anesthetics...Ch. 9 - 9.110 Industrially, ammonia is synthesized by the...Ch. 9 - Prob. 9.111QPCh. 9 - Prob. 9.112QPCh. 9 - Prob. 9.113SPCh. 9 - Prob. 9.114SPCh. 9 - Prob. 9.115SPCh. 9 - Prob. 9.116SPCh. 9 - Prob. 9.117SPCh. 9 - Prob. 9.118SP
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