gibbs free energy

velamj

Full Member
10+ Year Member
Apr 6, 2010
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  1. Pre-Medical
    Hello all...im having problems understanding a problem in chemistry. Tbh I think this book may be wrong (1001 mcat chem questions examkrackers #438)

    What is the standard Gibbs free energy of formation of water vapor at 25 degrees celsius if, for the reaction shown below under standard conditions, delta h = -484 KJ/MOL and delta S= -89 J/mol K ?

    2H2 (g) + O2(g) ----> 2 H20(g)

    a -457 kj/mol
    b -395 kj/mol
    c -229 kj/mol
    d. water vapor does not form at 25 degrees celsius

    I thought the answer was -457 but apparently its -229....

    I know to convert 89j/mol k to .089 KJ/MOL K ....THIS conversion gives me -457....what am i doing wrong here???? i would appreciate any help i can get thanks
     
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