Question

A container of gas with a pressure of 450 kPa contains three different gasses -hydrogen, oxygen, and nitrogen. If the partial pressure of the hydrogen is 210 kPa and the partial pressure of the oxygen is 125 kPa, what is the partial pressure of nitrogen?

Answer 1

`P_ ("N"_2) = 115` `"kPa"`

Explanation:

According to Dalton's law of partial pressures, the total pressure is equivalent to the sum of the pressures of the individual gases (if they were present alone).

Therefore, the partial pressure of `"N"_2` is simply

`overbrace(450color(white)(l)"kPa")^(P_"total")` `- overbrace(210color(white)(l)"kPa")^(P_("H"_2))` `- overbrace(125color(white)(l)"kPa")^(P_(""O"_2))` `= color(red)(115` `color(red)("kPa"`