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COMEDK2015ChemistryChemical Bonding and Molecular Structure

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

Options

  1. A-788 ~kJ / mol
  2. B+878 ~kJ / mol
  3. C+788 ~kJ / mol
  4. D-878 ~kJ / mol

Correct answer

A. -788 ~kJ / mol

Step-by-step solution

According to Hess law, gathered _ f H^ =S+D+I E + E A+U -411.2=108.4+121+495.6-348.6+U U=-787.6 ~kJ / mol =-788 ~kJ / mul gathered

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