To determine the empirical formula of a compound with the given elemental composition, we need to find the simplest whole number ratio of the elements present.

1. Convert the percentages to grams assuming a 100g sample:

- Carbon: 22 g

- Hydrogen: 4.6 g

- Bromine: 73.4 g

2. Convert the grams of each element to moles:

- Carbon: 22 g / 12.01 g/mol = 1.83 mol

- Hydrogen: 4.6 g / 1.008 g/mol = 4.57 mol

- Bromine: 73.4 g / 79.90 g/mol = 0.921 mol

3. Divide each mole value by the smallest mole value to get the simplest whole number ratio:

- Carbon: 1.83 mol / 0.921 mol ≈ 2

- Hydrogen: 4.57 mol / 0.921 mol ≈ 5

- Bromine: 0.921 mol / 0.921 mol = 1

4. Write the empirical formula using the whole number ratio:

C2H5Br

Therefore, the empirical formula of the compound is C2H5Br.