Which would you expect to have a higher melting point: sodium chloride, NaCl, or aluminum oxide, Al2O3?
(a) Aluminum oxide, because it is a larger molecule and has a greater number of molecular interactions
(b) NaCl, because it is a solid at room temperature
(c) Aluminum oxide, because of the greater charges of the ions and hence the greater force of attraction between them
(d) Aluminum oxide, because of the covalent bonds within the molecule
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