What is the approximate molecular mass of dry air containing 78% `N_(2)` and 22% `O_(2)` ?

Explanation

To find the approximate molecular mass of dry air containing 78% nitrogen (N₂) and 22% oxygen (O₂), we can follow these steps:

### Step 1: Determine the molecular mass of nitrogen (N₂)
- Nitrogen (N) has an atomic mass of approximately 14 g/mol.
- Since N₂ has two nitrogen atoms, its molecular mass is calculated as:
\[ \text{Molecular mass of } N_2 = 2 \times 14 = 28 \text{ g/mol} \]
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