Calculate the enthalpy of hydration for sodium hydroxide. Its lattice enthalpy is –887.0 kJ/mol and heat of solution is –44.51 kJ/mol.

• A. –785.4 kJ/mol
• B. –842.5 kJ/mol
• C. –931.5 kJ/mol
• D. 842.5 kJ/mol

Answer: (C)