Question

5. Consider an ionic compound MX2 where M is a metal that forms a cation of +2 charge, and X is a nonmetal that forms an anion of -1 charge. A Born-Haber cycle for MX2 is on the right. Each step in this cycle has been assigned a number (1-7). a) Which step (1-7) represents ?Hsublimation? b) Which step (1-7) represents ?Hf? c) Which steps (1-7) are endothermic, as written? d) Step 2 represents ; step 7 represents . e) Use the following energy values to calculate the lattice energy (in kJ/mol) for MX2. ?H°sub = 296 kJ/mol ?H°f = - 421 kJ/mol IE1 = 378 kJ/mol IE2 = 555 kJ/mol bond energy = 310 kJ/mol EA = - 427 kJ/mol M (s) + X2 (g) 3 6 1 M (g) 2 X (g) 4 MX2 (s) M+ (g) 7 5 2 M2+ (g) + 2 X- (g)

          5. Consider an ionic compound MX2 where M is a metal
that forms a cation of +2 charge, and X is a nonmetal
that forms an anion of -1 charge. A Born-Haber cycle
for MX2 is on the right. Each step in this cycle has
been assigned a number (1-7).
a) Which step (1-7) represents ?Hsublimation?
b) Which step (1-7) represents ?Hf?
c) Which steps (1-7) are endothermic, as written?
d) Step 2 represents ; step 7 represents .
e) Use the following energy values to calculate the lattice energy (in kJ/mol) for MX2.
?H°sub = 296 kJ/mol
?H°f = - 421 kJ/mol
IE1 = 378 kJ/mol
IE2 = 555 kJ/mol
bond energy = 310 kJ/mol
EA = - 427 kJ/mol
M (s) + X2 (g)
3 6 1
M (g) 2 X (g)
4 MX2 (s)
M+ (g) 7
5 2
M2+ (g) + 2 X- (g)

5. Consider an ionic compound MX2 where M is a metal
that forms a cation of +2 charge, and X is a nonmetal
that forms an anion of -1 charge. A Born-Haber cycle
for MX2 is on the right. Each step in this cycle has
been assigned a number (1-7).
a) Which step (1-7) represents ?Hsublimation?
b) Which step (1-7) represents ?Hf?
c) Which steps (1-7) are endothermic, as written?
d) Step 2 represents ; step 7 represents .
e) Use the following energy values to calculate the lattice energy (in kJ/mol) for MX2.
?H°sub = 296 kJ/mol
?H°f = - 421 kJ/mol
IE1 = 378 kJ/mol
IE2 = 555 kJ/mol
bond energy = 310 kJ/mol
EA = - 427 kJ/mol
M (s) + X2 (g)
3 6 1
M (g) 2 X (g)
4 MX2 (s)
M+ (g) 7
5 2
M2+ (g) + 2 X- (g)

Added by Steven T.

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