Final answer:
In the adjectives formula, the coefficients and subscripts must match.
Step-by-step explanation:
In the adjectives formula, the two things that must match are the coefficients and the subscripts.
The coefficient is a number placed in front of a chemical formula to indicate the number of molecules of a substance used or produced. The subscript is a number written in a chemical formula to indicate the number of atoms of an element in a molecule.
For example, in the formula for water (H₂O), the coefficient of 2 indicates that two water molecules are formed, and the subscript of 2 indicates that there are two hydrogen (H) atoms and one oxygen (O) atom in each water molecule.