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

    9
    ReputationRep:
    Why do we have to use pV = nRT to get its answer? Why can't we assume that mass of ice and steam will be the same and use that to find moles of steam? From those moles why can we just multiply them by 24 and get B as the answer? The answer in mark scheme is C.

    Offline

    1
    ReputationRep:
    You're heating it to 596k, not 298k.
    Doing it your way gives you the volume at 298k. It asks for 596k so double your answer to get C.

    You know that the temp and volume are directly propotional from PV=nRT.
    • Thread Starter
    Offline

    9
    ReputationRep:
    (Original post by Ollie901)
    You're heating it to 596k, not 298k.
    Doing it your way gives you the volume at 298k. It asks for 596k so double your answer to get C.

    You know that the temp and volume are directly propotional from PV=nRT.
    So I can double that volume Or use the molar gas equation at that temperature, right?
    Offline

    0
    ReputationRep:
    24 is a handy approximation, useful for rough work. If you want a more accurate answer or are not at room temperature and pressure then use the ideal gas equation
 
 
 
  • 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
    Would you rather give up salt or pepper?
  • 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...
    Reply
    Hide
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.