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, we will use the ideal gas law in the form of the combined gas equation:

\[ \frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2} \]

### Step-by-Step Solution:

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