The lattice enthalpy of KF is -808 kJ/mol and the enthalpy of solution of KF is -17.7 kJ/mol.Calculate the enthalpy of hydration of KF(s).
A) -790.3 kJ/mol
B) -35.4 kJ/mol
C) -825.7 kJ/mol
D) 790.3 kJ/mol
E) 825.7 kJ/mol

Question

Quizplus · Accepted Answer

The enthalpy of hydration of KF(s) can be calculated using the following equation:

ΔHhydration = ΔHsolution - ΔHlattice

where ΔHsolution is the enthalpy of solution, which is given as -17.7 kJ/mol, and ΔHlattice is the lattice enthalpy of KF, which is given as -10808 kJ/mol.

ΔHhydration = -17.7 kJ/mol - (-10808 kJ/mol)
ΔHhydration = 10808 kJ/mol - 17.7 kJ/mol
ΔHhydration = -825.7 kJ/mol

Therefore, the enthalpy of hydration of KF(s) is -825.7 kJ/mol, which is option C.

The Lattice Enthalpy of KF Is -808 KJ/mol and the Enthalpy