Question

What is the partial pressure of the helium gas? Express your answer in millimeters of mercury.

Answer 1

`P_"He" = 203` `"mm Hg"`

Explanation:

According to Dalton's law of partial pressures, the total pressure of the gaseous mixture is equal to the sum of the partial pressures of the gaseous components.

Therefore,

`P_"total" = P_ ("CO"_2) + P_ "Ar" + P_ ("O"_2) + P_ "He"`

`745` `"mm Hg"` `= 133` `"mm Hg"` `+ 214` `"mm Hg"` `+ 195` `"mm Hg"` `+ P_ "He"`

`P_ "He" = color(red)(203` `color(red)("mm Hg"`