To find the empirical formula, we need to determine the simplest whole number ratio of the carbon, hydrogen, and oxygen atoms in the compound.

Divide the number of each atom by its smallest subscript:

Carbon: 10 / 5 = 2

Hydrogen: 25 / 5 = 5

Oxygen: 5 / 5 = 1

Hence, the empirical formula for the compound is C2H5O.