# 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 #P_(He)# = #82.5# #kPa# and #P_(CO2)# = #.4# #kPa#?

##### 2 Answers

The partial pressure of oxygen in the mixture is 18.5 kPa.

#### Explanation:

The total pressure is the sum of the partial pressures of the given gases.

Rearrange the equation to isolate

The total pressure of

#### Explanation:

In a little more detail, the total pressure is the sum of the partial pressures of the gases present:

We want to know the partial pressure of oxygen,

Substituting in the known values gives the answer shown above.