Calculating Unknown Element Mass

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Background

The formula of a chemical compound is really a very compact code for the percent composition of the compound. Using the formula of a compound, the mass of one element contained within a given mass of the compound can be calculated. Textbook Discussion: Section 5.8, page 123. See Also: Example X, page 126.

Problem

How many grams of carbon  will be formed by the complete decomposition of 69.2 grams of a compound with the following formula?

C₆H₃CH₃(NO₂)₂

Atomic Masses: C=12.0 H=1.00 N=14.0 O=16.0 amu