In the combustion reaction `C_(3)H_(8)+O_(2) to CO_(2)+H_(2)O`, the coefficient for `O_2` is

Explanation

To determine the coefficient for \( O_2 \) in the combustion reaction of propane (\( C_3H_8 \)), we need to balance the chemical equation. Here’s how to do it step by step:

### Step 1: Write the unbalanced equation
The unbalanced equation for the combustion of propane is:
\[ C_3H_8 + O_2 \rightarrow CO_2 + H_2O \]

### Step 2: Count the number of atoms for each element
- **Reactants:**
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