Chem 251 Final Exam Worksheet - 2005 Page 7
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93. (7 pts) Construct Born-Haber cycle for MgO. Use the following thermochemical data to calculate
the lattice energy of MgO: standard enthalpy of formation at 298 K (∆
H°) of MgO = -602 kJ/mol,
f
∆
H° (Mg, s) = 148 kJ/mol, IE
(Mg,g) = 738 kJ/mol, IE
(Mg,g) = 1451 kJ/mol, D(O
, g) = 498
a
1
2
2
1
2
kJ/mol, ∆
H
(O, g) = -141 kJ/mol, and ∆
H
(O, g) = 880 kJ/mol.
EA
EA
-3930 kJ/mol (3927)
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