For NaCl ,lattice energy = – 186 kcal/mol, the solvation ene... | CHEMISTRY - IONIC OR ELECTROVALENT BOND | SolveeIt | Solveeit

Today, August 18

Question

For NaCl ,lattice energy = – 186 kcal/mol, the solvation energy of Na⁺ and Cl^– are –97 and – 85 kcal/mole respectively. Therefore for NaCl (s)

A

Enthalpy of solution is exothermic and magnitude equal 4 kcal/mol.

B

Enthalpy of solution is exothermic and magnitude equal to 368 kcal/mol

C

Enthalpy of solution is endothermic and magnitude equal to 4 kcal/mol

D

Enthalpy of solution is endothermic and magnitude equal to 368 kcal/mol

Answer

Enthalpy of solution is endothermic and magnitude equal to 4 kcal/mol

Explanation

Solution

∆H _solv = –97–85 = –182 kcal/mol

–LE = + 186 kcal/mol

∆H (solution) = + 186 – 182 = 4 kcal/mol & endothermic