Question

A mixture of helium, nitrogen, and oxygen has a total pressure of 752 mm Hg. The

partial pressures of helium and nitrogen are 234 mm Hg and 197 mm Hg, respectively.
What is the partial pressure of oxygen in the mixture?

Answer 1

Answer: The partial pressure of oxygen in the mixture is 321 mm Hg

Step-by-step explanation:

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

`p_(total)=p_(He)+p_(N_2)+p_(O_2)`

Given :
`p_(total)` = total pressure of gases = 752 mm Hg

`p_(He)` = partial pressure of Helium = 234 mm Hg

`p_(N_2)` = partial pressure of nitrogen = 197 mm Hg

`p_(O_2)` = partial pressure of oxygen = ?

Putting in the values we get:

`752mmHg=234mmHg+197mmHg+p_(O_2)`

`p_(O_2)=321mmHg`

The partial pressure of oxygen in the mixture is 321 mm Hg