First slide

Hess law of constant summation

Question

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

Moderate

A

${Na}^{+} (g) + {Cl}^{-} (g) \overset{}{\to} NaCl (s)$
B

$Na (s) \overset{}{\to} Na (g)$
C

${Cl}_{2} (g) \overset{}{\to} 2 Cl (g)$
D

$Na (g) + Cl (g) \overset{}{\to} {Na}^{+} (g) + {Cl}^{-} (g)$

Solution

(1) is lattice enthalpy, the heat liberated when one mole of ionic solid is formed from its constituents gaseous ions.
${Na}^{+} (g) + {Cl}^{-} (g) \overset{}{\to} NaCl (s), {ΔH}_{U} = - 788 kJ$ ;
2nd option….sublimation….Endothermic;
3rd option…..atomization….Endothermic;
4th option…..invoves IP(endothermic= +492kJ/mole) and EGE(exothermic= -361kJ/mole)

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