Sodium chloride (NaCl) is an unique compound.
there are many many compounds used in everyday. These are things like salt (NaCl) and water (H2O)and sugar (C6H12O6) .
These two compounds form a mixture because they can not react with each other under normal conditions.
The answeis is 3,82.1010 formula units (this expression is more corresct for ionic compounds).
Many compounds have lattice structures. A lattice is just a long repeated structure. This is evident in salts, such as NaCl, but can be present many other compounds. Other examples are Diamond, SiO2 (quartz), and ice.
NaCl (Sodium and Chlorine)
NaCl
Fe is the element iron and NaCl is the compound sodium chloride.
These compounds doesn't react.
Water and and sodium chloride are chemical compounds. The water solution of NaCl is a mixture.
There are many compounds that don't contain nitrogen: CO2, NaCl, H2O, C6H6, CuCl2...
NaCl