Results are out! Find what you Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

Kc Question troubles!

Announcements Posted on
Review your Uni: we’re almost at 10,000 reviews. Our 10,000th will win £100 amazon voucher! 21-09-2015
  1. Offline

    Here's the q:

    N2O4 and NO2 coexist in this equilibrium..

    2 NO2 <--=--> N2O4

    A chemist adds 4.00mol no2 to a container with a volume of 2dm3. The container is sealed, heated to a constant temp and allowed to reach equilibrium.

    the equilibrium mixture contains 3.2mol no2. Calculate Kc under these conditions.

    I understand everything up to the point where reacting ratio is 2:1 and that concentration of no2 is 1.6mol dm3. So I thought that the conc. of N2O4 would be 0.8, but markscheme says its 0.2. Why is this??
  2. Offline

    0.8 mol of NO2 has reacted, which means 0.4 mol of N2O4 is present according to the ratio in the chemical equation. Convert moles into concentration and it should be obvious :yes:


Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: June 8, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Today on TSR

You know you're a student when...

What's your defining moment?

What personality type are you?
Study resources
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.