Question

A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. what is the partial pressure of oxygen at 101.4 kpa if phe = 82.5 kpa and pco2 = 0.4 kpa?

Answer 1

18.5 kPa is the partial pressure of oxygen.

Step-by-step explanation:

Total pressure of the gases = p = 101.4 kPa

Partial pressure of the helium gas =
`p_(He)=82.5 kPa`

Partial pressure of the carbon dioxide gas =
`p_(CO_2)=0.4 kPa`

Partial pressure of the oxygen gas =
`p_(O_2)=?`

Applying Dalton's law of partial pressure:

`p=p_(He)+p_(CO_2)+p_(O_2)`

`101.4 kPa=82.5 kPa+0.4 kPa+p_(O_2)`

`p_(O_2)=101.4 kPa-82.5 kPa-0.4 kPa=18.5 kPa`

18.5 kPa is the partial pressure of oxygen.

Answer 2

Pressure of the Mixture = 101.4 kpa
Pressure of the helium phe = 82.5 kpa
Pressure of CO2 pco2 = 0.4 kpa.
Partial pressure of oxygen = Pressure of the Mixutre - (Pressure of the
helium + Pressure of CO2)
Partial pressure of oxygen = 101.4 - 82.5 - 0.4
Partial pressure of oxygen = 18.5 kPa