20. Using the data-below, calculate the lattice energy of magnesium oxide (MgO).

Question

20. Using the data-below, calculate the lattice energy of magnesium oxide (MgO). MgO (s) Mg2+ (g) + O2-(g) Chemical Reaction Mg(s) Mg (g) Mg (g) Mg' (g) + e- AH in kJ/mol Tpe of reaction 148 738 1450 499 -143 844 -602 Heat of sublimation 1st Ionization Energy 2nd Ionization Energy Bond Energy st Electron Affinity 2nd Electron Affinity Heat of formation 02 (g) 2 O (g) O. (g) + e- O2. (g) Mg (s) + 1/202 (g)-> MgO (s) (a) 4140 kJ/mol (b) 3890 kJ/mol (c) 2930 kJ/mol (d) 2680 kJ/mol (e) 2200 kJ/mol

Explanation / Answer

According to Born Haber cycle,

Heat of formation = sum of all different steps

- 602 = 148 + 738 + 1450 + (1/2)*499 - 143 + 844 + lattice energy

So,

Lattice energy = - 3888.5 = - 3890 approximately

So, the answer is (B)

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