Final answer:
The molecular formula of aspirin, composed of 9 carbon atoms, 8 hydrogen atoms, and 4 oxygen atoms, is C9H8O4, making option A) C9H8O4 the correct answer.
Step-by-step explanation:
The molecular formula of aspirin, which is comprised of 9 atoms of carbon (C), 8 atoms of hydrogen (H), and 4 atoms of oxygen (O), can be determined by counting the number of each type of atom present in the molecule. Given these counts, the molecular formula can be expressed as C9H8O4.
Therefore, the correct option for the molecular formula of aspirin, given a composition of 9 carbon atoms, 8 hydrogen atoms, and 4 oxygen atoms, is A) C9H8O4. This means that for every aspirin molecule, there are nine carbon atoms, eight hydrogen atoms, and four oxygen atoms. The molecular mass of an aspirin molecule is also valuable information, and it is calculated as the sum of the atomic masses of all the atoms in the molecule, which amounts to 180.15 amu (atomic mass units).