What are the chemical formulas for fog, sand, and vinegar? Or do they not have chemical formulas?

Sand and fog are both mixture and therefore they do not
have a chemical formula. Sand is term used for material that ones consisted of rocks and
has, as a part of natural process, crumbled to small particles. Like rocks the sands can
be of many different types. Each of these types is composed of mixtures of many
different minerals.

Fog is composed of fine particles of
moisture - that is water - suspended in air. The air itself is a mixture of many
different gases. The moisture of the fog is an additional ingredient in the mixture of
gases called air.

Common vinegar is also a mixture.
However, the main ingredient of vinegar, which is acetic acid, is a compound. The
chemical formula of Acetic acid is CH3COOH.