Assume 100 g sample.

Step 1. Determine mass of carbon for every 100 g sample.

$\mathbf{mass}\mathbf{}\mathbf{C}\mathbf{=}\mathbf{100}\mathbf{}\overline{)\mathbf{g}\mathbf{}{\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{2}}}\left(\frac{1\overline{)\mathrm{mol}{C}_{2}{H}_{2}}}{26.04\overline{)g{C}_{2}{H}_{2}}}\right)\left(\frac{2\overline{)\mathrm{mol}C}}{1\overline{)\mathrm{mol}{C}_{2}{H}_{2}}}\right)\left(\frac{12.01gC}{1\overline{)\mathrm{mol}C}}\right)\mathbf{=}$**92.24 g C**

Step 2. Calculate the percent composition of carbon.

Calculate the mass percent composition of carbon in each the following carbon compounds.

C_{2}H_{2}

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