First slide
Hess law of constant summation

A process can be Exothermic or Endothermic. Exothermic process of the following is 


(1) is lattice enthalpy, the heat liberated when one mole of ionic solid is formed from its constituents gaseous ions.

Na+g+Cl-g NaCls,ΔHU=788kJ;

2nd option….sublimation….Endothermic;

3rd option…..atomization….Endothermic;

4th option…..invoves IP(endothermic= +492kJ/mole) and EGE(exothermic= -361kJ/mole)

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