The molar mass of acetic acid (HC2H3O2) can be calculated by adding the atomic masses of each atom present in the molecule.

- Carbon (C): 12.01 g/mol

- Hydrogen (H): 1.01 g/mol

- Oxygen (O): 16.00 g/mol

Considering the number of atoms of each element in the formula:

- 2 Carbon atoms: 2 x 12.01 g/mol = 24.02 g/mol

- 4 Hydrogen atoms: 4 x 1.01 g/mol = 4.04 g/mol

- 2 Oxygen atoms: 2 x 16.00 g/mol = 32.00 g/mol

Adding up these values, we get the molar mass of acetic acid:

Molar mass of HC2H3O2 = 24.02 g/mol + 4.04 g/mol + 32.00 g/mol = 60.06 g/mol

Therefore, the molar mass of acetic acid (HC2H3O2) is approximately 60.06 grams per mole.