$\overline{)\mathbf{mass}\mathbf{}\mathbf{percent}\mathbf{=}\frac{\mathbf{mass}\mathbf{}\mathbf{element}}{\mathbf{total}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{compound}}\mathbf{\times}\mathbf{100}}$

First, we need to get the atomic weights of each element in HC_{2}H_{3}O_{2} using the periodic table and then calculate its molar mass.

molar mass H = 1.01 g/mol

molar mass C = 12.01 g/mol

molar mass O = 16.00 g/mol

molar mass HC_{2}H_{3}O_{2} = (1.01 g/mol x 4) + (12.01 g/mol x 2) + (16.00 g/mol x 2)

Acetic acid (HC_{2}H_{3}O_{2}) is the active ingredient in vinegar. Calculate the mass percent composition of oxygen in acetic acid.

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