Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at NTP. Take the diameter of an oxygen molecule to be `3Å`.

Explanation

To estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at Normal Temperature and Pressure (NTP), we will follow these steps:

### Step 1: Determine the radius of an oxygen molecule
Given the diameter of an oxygen molecule is \(3 \, \text{Å}\):
\[ \text{Radius} = \frac{\text{Diameter}}{2} = \frac{3 \, \text{Å}}{2} = 1.5 \, \text{Å} \]
Convert the radius from angstroms to meters:
...