We are asked to calculate for the **percent by mass (mass %) of C **in tetracycline (C_{22}H_{24}N_{2}O_{8}) and to do that we’re going to use the **mass percent formula **shown below:

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

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

Calculate the percentage by mass of oxygen in the following compounds.

tetracycline, C_{22}H_{24}N_{2}O_{8}

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