Calculate the hydration enthalpy of ions for NaCl(s) from the following data.
ΔlatticeH=+788 kJmol⁻¹
ΔsolH=+4 kJmol⁻¹

A. −784 kJmol⁻¹
B. −1084kJmol⁻¹
C. +784 kJmol⁻¹1
D. +1084kJmol⁻¹