MDCAT Chemistry MCQ #4310

The partial pressure of oxygen in air at 1 atm is 0.21 atm. What is its mole fraction?

MDCAT Chemistry MCQ #4310

  1. Question 1

    Q1. The partial pressure of oxygen in air at 1 atm is 0.21 atm. What is its mole fraction?

    • A) 0.21
    • B) 0.5
    • C) 0.79
    • D) 1.0

    Answer: 0.21

    Explanation: Mole fraction = partial pressure / total pressure = 0.21. Option B is incorrect mole fraction.