High School

A sample of hydrogen gas is collected by water displacement at 20.0 degrees Celsius, with the atmospheric pressure at 99.8 kPa. What is the pressure of the dry hydrogen, if the partial pressure of water vapor is 2.33 kPa at that temperature?

Answer :

The pressure of the dry hydrogen gas is 97.47 kPa.

The total pressure in the collection flask is the sum of the partial pressures of the dry hydrogen gas and the water vapor.

Using Dalton's law of partial pressures, the partial pressure of the dry hydrogen gas can be calculated by subtracting the partial pressure of water vapor from the total pressure.

[tex]P(dry H2) = P(total) - P(H2O) = 99.8 kPa - 2.33 kPa = 97.47 kPa.[/tex]

Learn more about Dalton's law here:

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