Hey there! Sign in to join this conversationNew here? Join for free
Turn on thread page Beta
    • Thread Starter
    Offline

    7
    ReputationRep:
    Which reaction has the largest positive value of SӨ?
    A. CO2(g) + 3H2(g)  CH3OH(g) + H2O(g)
    B. 2Al(s) + 3S(s)  Al2S3(s)
    C. CH4(g) + H2O(g)  3H2(g) + CO(g)
    D. 2S(s) + 3O2(g)  2SO3(g)

    Why is the answer C and not D? I understand the mole increases in C but in D, the state changes from solid to gas?
    Offline

    17
    ReputationRep:
    D involves 3x(g) -> 2x(g)

    Whereas C involves 2x(g) -> 4x(g)
    Offline

    9
    ReputationRep:
    (Original post by Pigster)
    D involves 3x(g) -> 2x(g)

    Whereas C involves 2x(g) -> 4x(g)
    I concur entirely.

    Entropy is in J K-1 mol-1 so the number of moles makes the difference here.
 
 
 
Poll
“Yanny” or “Laurel”

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.