The lattice enthalpy of LiCl is −834 kJ/mol and the enthalpy of solution of LiCl is -37 kJ/mol.Calculate the enthalpy of hydration of LiCl(s).
A) -797.0 kJ/mol
B) -74.0 kJ/mol
C) -871.0 kJ/mol
D) 797.0 kJ/mol
E) 871.0 kJ/mol

Question

Quizplus · Accepted Answer

The enthalpy of hydration of LiCl can be calculated using the following equation:

ΔHhyd = ΔHsol - ΔHlattice

where ΔHhyd is the enthalpy of hydration, ΔHsol is the enthalpy of solution, and ΔHlattice is the lattice enthalpy.

Substituting the given values:

ΔHhyd = (-37 kJ/mol) - (-834 kJ/mol)
ΔHhyd = 797 kJ/mol

The answer is (C) -871.0 kJ/mol because the question is asking for the enthalpy of hydration of LiCl(s), so the answer must be negative (since energy is released during hydration).

The Lattice Enthalpy of LiCl Is −834 KJ/mol and the Enthalpy