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Mass percent:

$\overline{){\mathbf{\%}}{\mathbf{mass}}{\mathbf{}}{\mathbf{C}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{}\mathbf{C}\mathbf{}\mathbf{in}\mathbf{}\mathbf{cpd}}{\mathbf{molar}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{cpd}}{\mathbf{\times}}{\mathbf{100}}}$

Compound is: **CH _{3}—H_{3}C or C_{2}H_{6}**

- Molar mass C
_{2}H_{6}= 30.07 g/mol

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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Based on our data, we think this problem is relevant for Professor Ingram's class at UWATERLOO.