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

Explanation

To estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP, we can follow these steps:

### Step 1: Determine the radius of an oxygen molecule
Given the diameter of an oxygen molecule is \(3 \, \text{Å}\) (angstroms), we can find the radius \(r\) by dividing the diameter by 2.

\[ r = \frac{3 \, \text{Å}}{2} = 1.5 \, \text{Å} = 1.5 \times 10^{-10} \, \text{m} \]
...