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 ifpHe = 82.5 kPa and pCO2 = 0.4 kPa

Ptotal = PHe + PO2 + PCO2. You know total and CO2 and He. Calculate PO2.

18.5 kPa

Anonymous is right

To calculate the partial pressure of oxygen in the breathing mixture, you need to subtract the partial pressures of helium and carbon dioxide from the total pressure.

The partial pressure of oxygen, represented as pO2, can be calculated using the following formula:

pO2 = total pressure - pHe - pCO2

In this case, the total pressure is given as 101.4 kPa, the partial pressure of helium (pHe) is 82.5 kPa, and the partial pressure of carbon dioxide (pCO2) is 0.4 kPa.

Substituting these values into the formula, we have:

pO2 = 101.4 kPa - 82.5 kPa - 0.4 kPa

Calculating this expression, we get:

pO2 = 18.5 kPa

Therefore, the partial pressure of oxygen in the breathing mixture is 18.5 kPa.