Chemistry

Problem

For

\text{NaCl}

, the lattice energy is

+787\,\text{kJ mol}^{-1}

and the enthalpy of hydration is

-784\,\text{kJ mol}^{-1}

. Using these values, determine the molar enthalpy of solution, including its sign, and state whether the dissolution is endothermic or exothermic.