A discharge tube of 2L capacity containing hydrogen gas was evacuated till the pressure inside is `1xx10^(-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 calculate the number of hydrogen molecules present in the discharge tube, we can follow these steps:

### Step 1: Convert the temperature to Kelvin
The temperature given is 27°C. To convert this to Kelvin, we use the formula:
\[ T(K) = T(°C) + 273 \]
\[ T = 27 + 273 = 300 \, K \]

### Step 2: Use the Ideal Gas Law to find the number of moles
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