Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    1
    ReputationRep:
    9 Two moles of compound P were placed in a vessel. The compound P was partly decomposed byheating. A dynamic equilibrium between chemicals P, Q and R was established.At equilibrium, x mol of R were present and the total number of moles present was (2 + x).What is the equation for this equilibrium?

    A P <---->2Q + R
    B 2P <---->2Q + R
    C 2P <---->Q + R
    D 2P <---->Q + 2R

    Answer is B, why?
    Offline

    1
    ReputationRep:
    (Original post by Deathlotus)
    9 Two moles of compound P were placed in a vessel. The compound P was partly decomposed byheating. A dynamic equilibrium between chemicals P, Q and R was established.At equilibrium, x mol of R were present and the total number of moles present was (2 + x).What is the equation for this equilibrium?

    A P <---->2Q + R
    B 2P <---->2Q + R
    C 2P <---->Q + R
    D 2P <---->Q + 2R

    Answer is B, why?

    as per option B:

    moles of P = ( 2 - x/2 )
    moles of Q =( x/2 )
    moles of R =( x )
    Then
    total moles = 2 + x

    got it?
    • Thread Starter
    Offline

    1
    ReputationRep:
    thank you, so this is a trial and error question?
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What's your favourite Christmas sweets?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.