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  4. For one mole of NaCl(s) the lattice enthalpy is

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Q. For one mole of $NaCl_{(s)}$ the lattice enthalpy isChemistry Question Image

COMEDKCOMEDK 2015Thermodynamics

Solution:

$\Delta /H° = S + D +J.E.+ E.A. + U $
$- 411.2 = 108.4 + 121 + 495.6 - 348.6 + U$
$U = - 787.6\, kJ/mol$
$= - 788 \,kJ/mol$

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