Final answer:
The formulas for NaCl and H2O indicate the composition and ratio of the elements in the compounds.
Step-by-step explanation:
The formulas for table salt, NaCl, and water, H2O, indicate the composition and ratio of the elements in the compounds.
NaCl: NaCl is an ionic compound composed of sodium cations (Na+) and chloride anions (Cl-) in a 1:1 ratio. It represents a formula unit of table salt.
H2O: H2O is a molecular formula for water. It indicates that water is composed of two hydrogen atoms (H) bonded to one oxygen atom (O) in a 2:1 ratio.