A tank is filled with a mixture of helium, oxygen, and carbon dioxide. The pressure inside the tank is 101.3 kPa. What is the partial pressure of oxygen, given the following partial pressures? A. 16.9 kPa B. 17.2 kPa C. 84.1 kPa D. 101.3 kPa

p he=84kPa

p co2 = 0.1 kPa

The answer to your question is p O2 = 17.2 kPa, letter b

Explanation:

Remember that in a mixture of gases, total pressure is equal to the sum of the pressure of individual gases.

Then

Pt = p He + p CO2 + p O2

Data

Pt = 101.3 kPa

pHe = 84kPa

pCO2 = 0.1 kPa

p O2 = ?

Substitution

101.3 = 84 + 0.1 + pO2

pO2 = 101.3 - 84 - 0.1

pO2 = 17.2 kPa