1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Reactions and Themodynamics Related Question

  1. Feb 11, 2008 #1
    1.) (a) Give the reaction, with molecular structures, of 2-propanol with KMnO4 and 1-pentanol with KMnO4 and calculate the differences in the average bond energies of the reactants and products (ignore KMnO4 and any other side reactions in the calculations).
    Answer:-
    the reaction, with molecular structures, of 2-propanol with KMnO4,is

    5CH3CHOHCH3 + 2KMnO4 + 6H+ → 5CH3COCH3 + 2Mn2 + + 8H2 O



    bond energy of reactants= C – C is 3 x 80 = 240
    C – H is 7 x 98=686
    C – O is 1 x 78=78
    O – H is 1 x 110=110
    The total bond energy of reactants = 240+686+78+110= 1114kcal/mole

    bond energy of products= C – C is 3 x 80 = 240
    C – H is 6 x 98=588
    C= O is 1 x 187=187
    The total bond energy of products = 240+588+187= 1015kcal/mole
    the differences in the average bond energies of the reactants and products,
    = 1114-1015= -99kcal/mole


    (THIS WILL NOT POST RIGHT FOR SOME REASON...)

    H H H H H H H H H
    ****|***|***|***|***|**************KMnO4********| | | |
    *********H -C-C-C-C-C-OH***** ------->**** H-C-C-C-C-C=O
    ***************|****|****|***|**|******************************** **| | | | |****************
    H H H HH H H H H H


    bond energy of reactants= C – C is 4 x 80 = 320
    C – H is 11 x 98=1078
    C – O is 1 x 78=78
    O – H is 1 x 110=110
    The total bond energy of reactants = 320+1078+78+110= 1586kcal/mole

    bond energy of products= C – C is 4 x 80 = 320
    C – H is 10 x 98=980
    C= O is 1 x 187=187
    The total bond energy of products = 320+980+187= 1487kcal/mole
    the differences in the average bond energies of the reactants and products,
    = 1586-1487= -99kcal/mole





    (b) From your calculations does it appear that formation of the ketone or the carboxylate salt is more thermodynamically favored? Why?
    Answer:-

    From the calculations it is seen that both the reactions are thermodynamically favaoured. Since, the bond enery of the products is less than that of reactants.


    Is this correct guys???
     
    Last edited: Feb 11, 2008
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you help with the solution or looking for help too?



Similar Discussions: Reactions and Themodynamics Related Question
  1. Reaction Rate Question (Replies: 0)

  2. Reaction mechanism (Replies: 0)

Loading...