A mixture of gases in a cyliner at `760 mm` pressure contains `65 %` nitrogen, `15%` oxygen, and `20%` carbon dioxide by volume. What is the partial pressure of each gas in `mm`?

Explanation

To solve the problem of finding the partial pressures of nitrogen, oxygen, and carbon dioxide in a mixture of gases, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Total Pressure**:
The total pressure of the gas mixture is given as \( P_{total} = 760 \, \text{mm} \).

2. **Identify the Percentages by Volume**:
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