A mixture of Ar, He, and O2 has a total pressure of 1,000 kPa (kilopascals). The partial pressure of argon is 150 kPa and helium is 300 kPa.

Question

What is the partial pressure of oxygen in this mixture?

Question 11 options:

1,450 kPa

700 kPa

850 kPa

550 kPa

Answer 1

The partial pressure of oxygen in the mixture can be found by subtracting the partial pressures of argon (150 kPa) and helium (300 kPa) from the total pressure (1,000 kPa):

Partial pressure of oxygen = Total pressure - Partial pressure of argon - Partial pressure of helium
Partial pressure of oxygen = 1,000 kPa - 150 kPa - 300 kPa
Partial pressure of oxygen = 550 kPa

Therefore, the partial pressure of oxygen in this mixture is 550 kPa.