**$\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}{\mathbf{CH}}_{\mathbf{4}}{\mathbf{N}}_{\mathbf{2}}\mathbf{S}}\mathbf{}\mathbf{\times}\frac{\mathbf{76}\mathbf{.}\mathbf{132}\mathbf{}\mathbf{g}\mathbf{}{\mathbf{CH}}_{\mathbf{4}}{\mathbf{N}}_{\mathbf{2}}\mathbf{S}}{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}{\mathbf{CH}}_{\mathbf{4}}{\mathbf{N}}_{\mathbf{2}}\mathbf{S}}}$ = 76.132 g CH _{4}N_{2}S**

**$\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}{\mathbf{CH}}_{\mathbf{4}}{\mathbf{N}}_{\mathbf{2}}\mathbf{S}}\mathbf{}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{C}}}{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}{\mathbf{CH}}_{\mathbf{4}}{\mathbf{N}}_{\mathbf{2}}\mathbf{S}}}\mathbf{\times}\frac{\mathbf{12}\mathbf{.}\mathbf{01}\mathbf{}\mathbf{g}\mathbf{}\mathbf{C}}{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{C}}}$ = 12.01 g C**

Calculate the percentage of carbon by mass in each of the compounds represented by the following models. (Carbon atoms are black spheres, hydrogen are grey, oxygen are red.)

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