(d) In the laboratory, the temperature is 295 K and the total pressure in the gas-collecting tube is 741.2 mmHg . If the vapor pressure of water at 295 K is 19.8 mmHg , determine the pressure of the H2(g) in the gas-collecting tube.

According to the Dalton Law in a blend of non-reacting gases, the entire pressure will be equivalent to the total of partial pressures of the individual gases.

The pressure of H₂ gas collected in the tube will be 721.3 mm Hg.

This can be calculated by:

Dalton's formula:

Given :  

Now using the formula we will calculate:

Therefore, the pressure of the hydrogen in the tube is 721.3 mm Hg.

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The pressure of the hydrogen in the gas-collecting tube is 721.3 mm Hg

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

Given : =total pressure of gases = 741.1 mm Hg

= partial pressure of water = 19.8 mm Hg

= partial pressure of hydrogen = ?

putting in the values we get:

Thus  the pressure of the hydrogen in the gas-collecting tube is 721.3 mm Hg