Taking `N_(2) and O_(2)` as main compounts of air (`79% N_(2),21%O_(2)` by volume ) what is the molecular mass of air? How has it been arrived at ?

Explanation

To calculate the molecular mass of air, which is primarily composed of nitrogen (N₂) and oxygen (O₂), we can follow these steps:

### Step 1: Identify the components and their percentages
The main components of air are:
- Nitrogen (N₂): 79% by volume
- Oxygen (O₂): 21% by volume

### Step 2: Convert percentages to mole fractions
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