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

    Hydrogen and carbon dioxide gases are mixed at 800K. A reversible reaction takes place.
    H2(g) + CO2(g)==> H2O(g) + CO(g)
    At equilibrium, the partial pressures of H2 and CO2 are both 10.0 kPa. Kp is 0.288 at 800K.
    What is the partial pressure of CO in the equilibrium mixture?
    A 5.37 kPa B 18.6 kPa C 28.8 kPa D 347 kPa

    Answer scheme says it's A. Can someone please show me the working?
    •  Official Rep

     Official Rep
    Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

    Kp= (partial pressure of CO x parital pressure of H20) / (partial pressure of CO2 x partial pressure of H2

    • Since the moles of CO2 and H2 are same, and they have equal partial pressures, we assume that the partial pressures of the two products will also be same since they too have the same number of moles

    Kp = p(CO) x p(H2O) / p(CO2) x p(H2)
    0.288= (p x p) / 10 x 10
    0.288= p^2 / 100
    0.288 x 100= p^2
    28.8 = p^2
    _/28.8 = _/p^2
    5.366 = p
    p ~ 5.37kPa

    So answer is A
  • 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
    Has a teacher ever helped you cheat?
    Help with your A-levels

    All the essentials

    The adventure begins mug

    Student life: what to expect

    What it's really like going to uni


    Essay expert

    Learn to write like a pro with our ultimate essay guide.

    Uni match

    Uni match

    Our tool will help you find the perfect course for you

    Study planner

    Create a study plan

    Get your head around what you need to do and when with the study planner tool.

    Study planner

    Resources by subject

    Everything from mind maps to class notes.

    Hands typing

    Degrees without fees

    Discover more about degree-level apprenticeships.

    A student doing homework

    Study tips from A* students

    Students who got top grades in their A-levels share their secrets

    Study help links and info

    Can you help? Study help unanswered threadsRules and posting guidelines

    Sponsored content:



    Find out how a Higher Education Achievement Report can help you prove your achievements.

    Groups associated with this forum:

    View associated groups
  • 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

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