
(a)
Interpretation:
Energy change for the given reaction has to be calculated using ionization energy and
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
(a)

Answer to Problem 9.73QP
The energy change for the given reaction is calculated as
Explanation of Solution
The given reaction is,
With reference to table
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,
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,
(b)
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
(b)

Answer to Problem 9.73QP
The energy change for the given reaction is calculated as
Explanation of Solution
The given reaction is,
With reference to table
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,
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,
(c)
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
(c)

Answer to Problem 9.73QP
The energy change for the given reaction is calculated as
Explanation of Solution
The given reaction is,
With reference to table
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,
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,
Want to see more full solutions like this?
Chapter 9 Solutions
General Chemistry
- Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely: (a) 0.000259 M HClO4arrow_forwardWhat is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.160 mol of NaOH were added?arrow_forwardDetermine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution. If neutral, simply write only NR. Be sure to include the proper phases for all species within the reaction. NaN₃arrow_forward
- A. Draw the structure of each of the following alcohols. Then draw and name the product you would expect to produce by the oxidation of each. a. 4-Methyl-2-heptanol b. 3,4-Dimethyl-1-pentanol c. 4-Ethyl-2-heptanol d. 5,7-Dichloro-3-heptanolarrow_forwardWhat is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.160 mol of NaOH were added?arrow_forwardCan I please get help with this.arrow_forward
- Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution. If neutral, simply write only NR. Be sure to include the proper phases for all species within the reaction. N₂H₅ClO₄arrow_forwardPlease help me with identifying these.arrow_forwardCan I please get help with this?arrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY





