MDCAT Chemistry MCQ #4300

A gas is collected over water at 25°C and 1 atm. If the vapor pressure of water is 23.8 mmHg, what is the partial pressure of the gas?

MDCAT Chemistry MCQ #4300

  1. Question 1

    Q1. A gas is collected over water at 25°C and 1 atm. If the vapor pressure of water is 23.8 mmHg, what is the partial pressure of the gas?

    • A) 736.2 mmHg
    • B) 760 mmHg
    • C) 783.8 mmHg
    • D) 800 mmHg

    Answer: 736.2 mmHg

    Explanation: Ptotal = Pgas + Pwater. So, Pgas = 760 - 23.8 = 736.2 mmHg. Option B is total pressure, not gas pressure.