The empirical formula of the given compound is C4H7O2. To calculate the empirical formula, you need to first calculate the relative atomic masses of the elements. Carbon has an atomic mass of 12.0107, hydrogen has an atomic mass of 1.00794, and oxygen has an atomic mass of 15.9994.
Then, divide the mass of each element by its respective atomic mass, and multiply the results by the smallest whole number to get the simplest ratio of elements. For example, 80.19/12.0107 = 6.67, and 9.62/1.00794 = 9.54. The smallest number that can be multiplied to both 6.67 and 9.54 is 4, so the ratio of elements is C:4, H:7, and O:2.
Therefore, the empirical formula of the given compound is C4H7O2.