The lattice enthalpy and the enthalpy of hydration are both always positive.

Name: The lattice enthalpy and the enthalpy of hydration are both always positive.
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Quizplus · Accepted Answer

Lattice enthalpy is always positive because it represents the energy required to separate a mole of a solid ionic compound into its gaseous ions. However, the enthalpy of hydration can be either positive or negative, but it is typically negative because it represents the energy released when gaseous ions are solvated by water molecules.

The Lattice Enthalpy and the Enthalpy of Hydration Are Both