Exactly `100 mL` of oxygen is collected over water of `23^(@)C` and `800 mm` pressure. Calculate the volume of dry oxygen at `NTP`. (Vapour pressure of water at `23^(@)C` is `21 mm`.)

Explanation

To solve the problem of calculating the volume of dry oxygen at NTP (Normal Temperature and Pressure), we will follow these steps:

### Step-by-Step Solution:

1. **Identify Given Data**:
- Volume of oxygen collected over water, \( V_1 = 100 \, \text{mL} \)
- Total pressure, \( P_1 = 800 \, \text{mmHg} \)
- Temperature, \( T_1 = 23^\circ C \)
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