which represents the empirical formula for A3B9

2 Answer

  • Empirical formula would be AB3. Empirical formula shows the simplest ratio of atoms in the compound (doesn't show the actual amount of each element in the compound)
  • Answer:

    The empirical formula  will be AB₃.


    In chemistry the empirical formula is an expression that represents the simplest proportion in which the atoms that form a chemical compound are present. It is therefore the simplest representation of a compound.

    In this example the compound A₃B₉ has 3 atoms of A and 9 atoms of B.

    The simplest positive integer ratio of atoms of the compound will be 1:3 (1 atom of A and 3 atoms of B). In other words we have to divide by 3 each subindex of the compound.