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To determine the number of carbon (C) atoms in the reactants of the given chemical equation:
\[ C_7H_{16} + O_2 \rightarrow CO_2 + H_2O \]
In the reactants, we have:
1. **C₇H₁₆**: This compound has **7 carbon (C) atoms**.
2. **O₂**: This compound contains oxygen atoms, but no carbon atoms.
Thus, in the reactants of the equation, there are a total of **7 carbon atoms**.