If `200 mL " of " N_(2) " at " 25^(@)C` and a pressure of 250 mm are mixed with `350 mL " of " O_(2) " at " 25^(@)C` and a pressure of 300 mm so that, the volume of resulting mixture is `300 mL`, what would be the final pressure of the mixture at `25^(@)C`?

Explanation

To find the final pressure of the gas mixture, we can use the principle of conservation of gas pressure, which states that the sum of the pressures of the individual gases (when adjusted for their volumes) will equal the pressure of the mixture.

### Step-by-Step Solution:

1. **Identify Given Values:**
- For Nitrogen (N₂):
- Volume (V₁) = 200 mL
- Pressure (P₁) = 250 mm Hg
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