Please help me with this Chemistry question.

Question

Which substance from the list would you expect to have a higher melting point, and why?

NH₃

MgCl₂

SF₆

C₆H₁₂O₆

Answer 1

You might expect MgCl₂ (an ionic compound) to have the highest melting point.

Reason(s):

MgCl₂ is the only ionic compound in the list, and ionic compounds are know to have relatively high melting points because of the high lattice energy that holds them together. Ammonia (NH₃), sulfur hexafluoride (SF₆) and C₆H₁₂O₆ (could be any number of compounds) are all molecular covalent compounds and the forces holding these molecules together are weaker than those in the crystal lattice of MgCl₂.

Answer 2

The answer would be Magnesium chloride because it is an ionic compound. Hope this helps!