Consider the generic compound MX3. M3+ is the metal cation and X– is the nonmetal anion. A. Balance the formation equation given on row viii. B. Write the balanced equation associated with each reaction/process (rows i through vii). You can use the table as a template for Hess's law if you need it, but you do not need to copy the entire thing. C. Apply Hess's law to the equations from parts a and b. Clearly show the the species that cancel and the ones that don't. Remember that the equations need to sum to ΔHf. D. Calculate the enthalpy of dissociation (or bond energy) of the X-X bond. Treat multiplication as consecutive addition for the purpose of sig. figs.

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Chapter1: Chemical Foundations
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Consider the generic compound MX3. M3+ is the metal cation and X– is the nonmetal anion. A. Balance the formation equation given on row viii. B. Write the balanced equation associated with each reaction/process (rows i through vii). You can use the table as a template for Hess's law if you need it, but you do not need to copy the entire thing. C. Apply Hess's law to the equations from parts a and b. Clearly show the the species that cancel and the ones that don't. Remember that the equations need to sum to ΔHf. D. Calculate the enthalpy of dissociation (or bond energy) of the X-X bond. Treat multiplication as consecutive addition for the purpose of sig. figs.
Reaction
AH value
Reaction/Process
Enthalpy of
sublimation of M
i.
AHsub = 137 kJ/mol
First ionization energy
of M
ii.
AHJE1 = 765 kJ/mol
AHIE2 = 1221
kJ/mol
Second ionization
energy of M
i.
->
AHIE3 = 7453
kJ/mol
Third ionization
energy of M
iv.
Enthalpy of
dissociation of X2 (g)
AHD = ??
V.
%3D
AHEA1 = -366
kJ/mol
First electron affinity
of X
vi.
AHlattice = -5230.
kJ/mol
vii.
Lattice energy of MX3
Enthalpy of formation
viii.
M (s) +
X2 (g)
MX3 (s)
AH = 3882 kJ/mol
%3D
of MX3
---
---
---
Transcribed Image Text:Reaction AH value Reaction/Process Enthalpy of sublimation of M i. AHsub = 137 kJ/mol First ionization energy of M ii. AHJE1 = 765 kJ/mol AHIE2 = 1221 kJ/mol Second ionization energy of M i. -> AHIE3 = 7453 kJ/mol Third ionization energy of M iv. Enthalpy of dissociation of X2 (g) AHD = ?? V. %3D AHEA1 = -366 kJ/mol First electron affinity of X vi. AHlattice = -5230. kJ/mol vii. Lattice energy of MX3 Enthalpy of formation viii. M (s) + X2 (g) MX3 (s) AH = 3882 kJ/mol %3D of MX3 --- --- ---
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