A discharge tube of 2 litre capacity containing hydrogen gas was evacuated till the pressure inside is `1 xx 10^(-5)` atm. If the tube is maintained at a temperature of `27^@C`, calculate the number of hydrogen molecules still present in the tube.

Explanation

To solve the problem of calculating the number of hydrogen molecules present in a discharge tube of 2 liters at a pressure of \(1 \times 10^{-5}\) atm and a temperature of \(27^\circ C\), we can follow these steps:

### Step 1: Convert Temperature to Kelvin
The temperature in Celsius needs to be converted to Kelvin using the formula:
\[ T(K) = T(°C) + 273.15 \]
For \(27^\circ C\):
...