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(a) Write the chemical equations that are used in

Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward ISBN: 9780321696724 27

Solution for problem 102IE Chapter 8

Chemistry: The Central Science | 12th Edition

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Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward

Chemistry: The Central Science | 12th Edition

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Problem 102IE

Problem 102IE

(a) Write the chemical equations that are used in calculating the lattice energy of SrCl2(s) via a Born–Haber cycle. (b) The second ionization energy of Sr(g) is 1064 kJ/mol. Use this fact along with data in Appendix C, Figure, Figure, and Table to calculate ΔHf° for SrCl2(s).

The value for astatine, At, is missing in this figure. To the nearest 100 kJ>mol, what estimate would you make for the first ionization energy of At?

Figure Trends in first ionization energies of the elements.

Why are the electron affinities of the Group 4A elements more negative than those of the Group 5A elements?

Figure Electron affinity in kJ/mol for selected s-and p-block elements.

Table Lattice Energies for Some Ionic Compounds

Compound

Lattice Energy (kJ/mol)

Compound

Lattice Energy (kJ/mol)

LiF

1030

MgCl2

2326

LiCl

834

SrCl2

2127

LiI

730

 

 

NaF

910

MgO

3795

NaCl

788

CaO

3414

NaBr

732

SrO

3217

NaI

682

 

 

KF

808

ScN

7547

KCl

701

 

 

KBr

671

 

 

CsCl

657

 

 

CsI

600

 

 

Step-by-Step Solution:

Problem 1021E

(a) Write the chemical equations that are used in calculating the lattice energy of  via a Born-Haber cycle. (b) The second ionization energy of Sr(g) is 1064 kJ/mol. Use this fact along with data in Appendix C, Figure, Figure, and Table to calculate AHfº for . The value for astatine, At, is missing in this figure. To the nearest 100 kJ>mol, what estimate would you make for the first ionization energy of At?

                                                           Step by step solution

Step 1 of 2

(a)

Born-Haber cycle for calculating lattice energy of   -

i)

Conversion of solid Sr to Sr(g) :-

                             

ii)

Dissociation of 1/2 mol of Cl,(g) into separate gaseous  atoms.

                                 

iii)

Ionization of Sr(g);

                                         

                                         

iv)

Electron affinity of Cl(g);

                                         

                                         

v)

Combination of gaseous ions:-

                           

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Step 2 of 2

Chapter 8, Problem 102IE is Solved
Textbook: Chemistry: The Central Science
Edition: 12
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward
ISBN: 9780321696724

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(a) Write the chemical equations that are used in