Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Solid State – General · Exam: JAM 2001-2022 · Marks: 2 · Difficulty: Hard
MgO crystallizes as rock salt structure with unit cell length $2.12 \AA$. From electrostatic model, the calculated lattice energy in $\mathrm{kJ} \mathrm{mol}^{-1}$ (rounded off to the nearest integer) is ____ . (Given: $\mathrm{N}_{\mathrm{A}}=6.022 \times 10^{23} \mathrm{mol}^{-1}$; Madelung constant $=1.748 ; \varepsilon_{0}=8.854 \times 10^{-12} \mathrm{J}^{-1} \mathrm{C}^{2} \mathrm{m}^{-1}$; charge of an electron $=1.602 \times 10^{-19} \mathrm{C}$ )
Answer
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