8.83 Construct a Born-Haber cycle for the formation of the hy-pothetical compound NaCl2, where the sodium ion has a 2+charge (the second ionization energy for sodium is given inTable 7.2). (a) How large would the lattice energy need to befor the formation of NaCl2 to be exothermic? (b) If we wereto estimate the lattice energy of NaCl2 to be roughly equalto that of MgCl2 (2326 kJ/mol from Table 8.1), what valuewould you obtain for the standard enthalpy of formation,AH, of NaCl2? ing together of Na (g) and Cl(AH=-788 kJ/mol).NoticeTable 8.1 lists the lattice energies for a number of ionic compounds. The largeitive values indicate that the ions are strongly attracted to one another in ionic solidPosTABLE 8.1 Lattice Energies for Some Ionic CompoundsLattice Energy (kJ/mol)Lattice Energy (kJ/moCompound2526CompoundMgCl210302127LiFSrCl2834LiCl730Lil3795MgO910NaF3414CaO788NaCl3217SrO732NaBr682NalScN7547KF808КС.701KBr671CsCl657CsI600

Question
Asked Oct 16, 2019
8.83 Construct a Born-Haber cycle for the formation of the hy-
pothetical compound NaCl2, where the sodium ion has a 2+
charge (the second ionization energy for sodium is given in
Table 7.2). (a) How large would the lattice energy need to be
for the formation of NaCl2 to be exothermic? (b) If we were
to estimate the lattice energy of NaCl2 to be roughly equal
to that of MgCl2 (2326 kJ/mol from Table 8.1), what value
would you obtain for the standard enthalpy of formation,
AH, of NaCl2?
help_outline

Image Transcriptionclose

8.83 Construct a Born-Haber cycle for the formation of the hy- pothetical compound NaCl2, where the sodium ion has a 2+ charge (the second ionization energy for sodium is given in Table 7.2). (a) How large would the lattice energy need to be for the formation of NaCl2 to be exothermic? (b) If we were to estimate the lattice energy of NaCl2 to be roughly equal to that of MgCl2 (2326 kJ/mol from Table 8.1), what value would you obtain for the standard enthalpy of formation, AH, of NaCl2?

fullscreen
ing together of Na (g) and Cl
(AH=-788 kJ/mol).
Notice
Table 8.1 lists the lattice energies for a number of ionic compounds. The large
itive values indicate that the ions are strongly attracted to one another in ionic solid
Pos
TABLE 8.1 Lattice Energies for Some Ionic Compounds
Lattice Energy (kJ/mol)
Lattice Energy (kJ/mo
Compound
2526
Compound
MgCl2
1030
2127
LiF
SrCl2
834
LiCl
730
Lil
3795
MgO
910
NaF
3414
CaO
788
NaCl
3217
SrO
732
NaBr
682
Nal
ScN
7547
KF
808
КС.
701
KBr
671
CsCl
657
CsI
600
help_outline

Image Transcriptionclose

ing together of Na (g) and Cl (AH=-788 kJ/mol). Notice Table 8.1 lists the lattice energies for a number of ionic compounds. The large itive values indicate that the ions are strongly attracted to one another in ionic solid Pos TABLE 8.1 Lattice Energies for Some Ionic Compounds Lattice Energy (kJ/mol) Lattice Energy (kJ/mo Compound 2526 Compound MgCl2 1030 2127 LiF SrCl2 834 LiCl 730 Lil 3795 MgO 910 NaF 3414 CaO 788 NaCl 3217 SrO 732 NaBr 682 Nal ScN 7547 KF 808 КС. 701 KBr 671 CsCl 657 CsI 600

fullscreen
check_circleExpert Solution
Step 1

Born-Haber cycle for the formation of hypothetical compound NaCl2 is constructed as follows,

Na2 (g) 2C1 (g)
2 x E (CI)
13(Na)
Na2 (g)+2CI (g)
Na (g) 2CI (g)
1,(Na)
Na (g)+2Cl (g)
2 AHf [CI (g)
Na (g) + Cl2 (g)
AH'f INa (g)
Na (s)Cl2 (g)
NaCl2 (s)
Lattice energy of NaCl2
Energy
help_outline

Image Transcriptionclose

Na2 (g) 2C1 (g) 2 x E (CI) 13(Na) Na2 (g)+2CI (g) Na (g) 2CI (g) 1,(Na) Na (g)+2Cl (g) 2 AHf [CI (g) Na (g) + Cl2 (g) AH'f INa (g) Na (s)Cl2 (g) NaCl2 (s) Lattice energy of NaCl2 Energy

fullscreen
Step 2

(a). The lattice energy can be c...

AHONaCl (s)AH Na (g)]2x AH[c1 (8)1(Na), (Na) +2x E (CI)- AH,
lattice
[Nacl,]
108kJ+(2x122kJ)496kJ +4562 kJ+ (2x-349KJ)- AHO NaC
ΔΗ.
lattice
= 4712kJ- AH NaC1, (s
AH
'lattice
Дн.
Therefore, the lattice energy for the formati on of NaClislarger than the formation of the NaCl compound
help_outline

Image Transcriptionclose

AHONaCl (s)AH Na (g)]2x AH[c1 (8)1(Na), (Na) +2x E (CI)- AH, lattice [Nacl,] 108kJ+(2x122kJ)496kJ +4562 kJ+ (2x-349KJ)- AHO NaC ΔΗ. lattice = 4712kJ- AH NaC1, (s AH 'lattice Дн. Therefore, the lattice energy for the formati on of NaClislarger than the formation of the NaCl compound

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour*

See Solution
*Response times may vary by subject and question
Tagged in

Science

Chemistry

General Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: Calculate the molarity of the acid (HA) and the conjugate base (A- ) . For acetate, use grams-to-mol...

A: (a)The molarity of conjugate base can be calculated as 

question_answer

Q: Describe the hydrogen bond. Explain how a neutral molecules can become polar.

A: Hydrogen bonding can take place between a highly electronegative atom and hydrogen. Intramolecular h...

question_answer

Q: Identify the type of interactions in each compound (ionic, dipole -dipole, hydrogen bond, etc...) d....

A: The ionic interactions are electrostatic attraction between a positive and a negative ion. It occurs...

question_answer

Q: -f 39 Attempt 3 If the symbol X represents a central atom, Y represents outer atoms, and Z represent...

A: The Lewis structure is also known as electron dot structure. It is the complete representation of a ...

question_answer

Q: Container A holds 742 mL of an ideal gas at 2.80 atm. Container B holds 174 mL of a different ideal ...

A: Given, container A holds 742mL of an ideal gas at 2.80atm and container B holds 174mL of different i...

question_answer

Q: We did a lab and have to answer the following question: What was the concentration of the NaOH solut...

A: The balanced chemical equation for the reaction of NaOH and KHP is given below.

question_answer

Q: predict the major product of the reaction sequence below

A: The given reactant is: 

question_answer

Q: How can you tell by looking at a compound if there is hydrogen bonding?

A: A hydrogen bond refers to a special type of bond or dipole-dipole attraction that takes place when h...

question_answer

Q: I mix 9.99 grams of nitrogen, 9.18 grams of hydrogen and 9.05 grams of helium in a flask. If the tot...

A: From the given masses of nitrogen, hydrogen and helium, the moles can be calculated.