Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Balanced chemical equation

  1. May 7, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1.0 dm3 reaction vessel contains initially 1.0 mol of N2O4(g) and 1.0 mol of NO2(g).
    At equilibrium, 0.75mol of N2O4(g) are present.
    What is the value of Kc?
    A. 0.33
    B. 0.50
    C. 2.0
    D. 3.0

    3. The attempt at a solution
    Right answer = D, but I do not why. My attempt for Kc is (3/4)^2 / (9/8) = 0.5, so wrong answer. Please, help me with this stricky one.

    Attached Files:

    • phy.JPG
      File size:
      13.1 KB
    Last edited: May 7, 2008
  2. jcsd
  3. May 7, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Show the equilibrium equation in terms of the agents and also the actual balanced chemical equation.
  4. May 9, 2008 #3
    Yes indeed. That is the right method to solve this.

    Thank you!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook