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Homework Help: Chemistry Question -- Opening a valve between two containers...

  1. Apr 27, 2016 #1
    1. The problem statement, all variables and given/known data
    Two closes containers are connected by a valve, which initially separates the containers from each other. C
    Container A has 8.00 L of H2 at 3.00 atm and temperature 400 k.
    Container B has 6.00 L of O2 at 4.00 atm and temperature 400 k

    The valve is opened, the gases mix, and they then react to form H2O. (temperature for both stay the same)
    Find the moles of each gases before the valve is opened.
    2. Relevant equations
    Chemical formula: 2 H2 (g) + O2 (g) === 2 H2O (g)

    3. The attempt at a solution
    for H2: PV/ RT , (3.00 atm) (8.00 L) / (0.0821 (L atm/ mol k)) (400 k) = 0.731 mol H2

    I also got the same moles for O2, but i feel like i did something wrong. Can anyone help me?
  2. jcsd
  3. Apr 28, 2016 #2


    User Avatar

    Staff: Mentor

    You did OK, the part about the reaction is irrelevant to the system before the valve was open.
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