Question

What is the standard enthalpy of formation of sodium chloride (NaCl) given the following information: the standard enthalpy of formation of sodium (Na) is -108.5 kJ/mol and the standard enthalpy of formation of chlorine (Cl2) is 0 kJ/mol?

Answer 1

The given information is not sufficient to directly calculate the standard enthalpy of formation of sodium chloride  NaCl . The standard enthalpy of formation of sodium  Na  and chlorine  Cl2  are not relevant to the formation of NaCl.To determine the standard enthalpy of formation of NaCl, you would need the following information:1. The standard enthalpy of sublimation of sodium  Na  to form gaseous sodium atoms  Na g  .2. The bond dissociation energy of chlorine  Cl2  to form gaseous chlorine atoms  Cl g  .3. The standard enthalpy of formation of NaCl from gaseous sodium and chlorine atoms  Na g  + Cl g   NaCl .Once you have this information, you can add the enthalpies together to find the standard enthalpy of formation of NaCl.