How many molecules are in NaCl?
Sodium chloride (NaCl) is an ionic substance. Therefore, there are no simple, discreet molecules of sodium chloride (or of other ionic solids for that matter). A sample of NaCl is instead made up of a lattice held together by strong ionic bonds. The formula NaCl is merely the simplest stochiometric ratio for the ionic crystal, which contains one Na atom for every Cl atom.