What is the triangle cap h sub sol for NaCl rightarrow Na raised to the plus plus Cl raised to the negative power power ? The lattice energy is negative 788 kJ/mol , the enthalpy of hydration for Na raised to the plus power is negative 410 kJ/mol , and the enthalpy of hydration for Cl raised to the negative power is negative 313 kJ/mol Use triangle cap h sub sol is equal to negative triangle cap h sub lat plus triangle cap h sub hydr