engineering chemistry MCQ #3406

A mixture of N2 and O2 has a total pressure of 1 atm. If the partial pressure of N2 is 0.8 atm, what is the mole fraction of O2?

engineering chemistry MCQ #3406

  1. Question 1

    Q1. A mixture of N2 and O2 has a total pressure of 1 atm. If the partial pressure of N2 is 0.8 atm, what is the mole fraction of O2?

    • A) 0.2
    • B) 0.8
    • C) 0.5
    • D) 0.1

    Answer: 0.2

    Explanation: Use Dalton's law of partial pressures: P_total = P_N2 + P_O2. So, P_O2 = 1 - 0.8 = 0.2 atm, and X_O2 = P_O2 / P_total = 0.2.