We are asked to calculate for the **percent by mass (mass %) of O** in carbon dioxide (CO_{2}) and to do that we’re going to use the **mass percent formula** shown below:

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

For the percent by mass O, we’re going to rewrite the equation as:

Calculate the mass of oxygen in a molecule of CO_{2} by using percentage composition?

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