Oxygen is present in a one-litre flask at a pressure of `7.6 xx 10^(-10)` mm Hg. Calculate the number of oxygen molecules in the flask at `0^(C)`.

Explanation

To solve the problem of calculating the number of oxygen molecules in a one-litre flask at a pressure of \(7.6 \times 10^{-10}\) mm Hg and a temperature of \(0^{\circ}C\), we can follow these steps:

### Step 1: Convert Pressure from mm Hg to Atmospheres
The pressure given is in mm Hg, and we need to convert it to atmospheres. We know that:
\[ 1 \text{ atm} = 760 \text{ mm Hg} \]
Thus, we can convert the pressure as follows:
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