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Drawing and labeling reaction profile

Posted: Thu Feb 25, 2016 8:33 pm
by Jacob Afable 3J
4.35 says to draw and label the reaction profile for the reaction: CH3Br + -OH CH3OH + Br-.

For this particular reaction, how do we know that the Gibbs free energy of the reaction between the reactants and products is negative?

For other reactions, how will we know whether G will be positive or negative between the reactants and products?

Re: Drawing and labeling reaction profile

Posted: Thu Feb 25, 2016 10:19 pm
by Alli Foreman 2H
is equal to

If the graph's final point is below the initial point, then that means that and therefore will be negative.

If the graph's final point is above the initial point, then that means that and therefore will be positive.

Re: Drawing and labeling reaction profile

Posted: Sat Feb 27, 2016 3:00 pm
by Jacob Afable 3J
Alli Foreman 2H wrote: is equal to

If the graph's final point is below the initial point, then that means that and therefore will be negative.

If the graph's final point is above the initial point, then that means that and therefore will be positive.



How about for G

Re: Drawing and labeling reaction profile

Posted: Sat Mar 12, 2016 12:03 am
by Alli Foreman 2H
is always positive. It is the difference between the of the reactants and the of the intermediates. intermediates is always above reactants (think of the graph, it's always a hill shape).
So of the intermediates - of the reactants is always positive.