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Chem equilibrium

Discussion in 'DAT Discussions' started by sl2obel2ts, Jun 21, 2008.

  1. sl2obel2ts

    sl2obel2ts i like tomatoes 7+ Year Member

    Sep 26, 2007
    Is the reaction at EQ if
    1. G = 0
    2. change in S = 0

    wiki says 1
    kaplan practice tests says 2 (GC subject test 5 # 24)

    which one is right?

    i think kaplan is wrong. at eq, entropy should increase like universe does. I think i learned this in thermo engineering class.
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  3. harrygt

    harrygt 2+ Year Member

    Jun 16, 2008
    Actually, Kaplan is the one who is right.
    At equilibrium , Delta S of the universe is zero [You have the maximum entropy of universe at equil, and it can't get bigger]. delta G is zero at equilibrium too, but not G. G certainly has a value and is not zero.
    Remember, the CHANGE in S, and the CHANGE in G are zero at equil. Choice one would be correct if it was delta G = zero, not G = 0.
    I hope this helps.

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