Why are spontaneous and non-spontaneous reactions often coupled?

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Why are spontaneous and non-spontaneous reactions often coupled? 

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Spontaneous reaction: the reaction which take place on its own without any initiation are spontaneous reaction.

For a reaction to be spontaneous the Gibbs free energy change of the reaction must be negative.

Non-Spontaneous reaction: the reaction which do not take place on its own  and requir initiation are non-spontaneous reaction.

For a reaction to be non-spontaneous the Gibbs free energy change of the reaction must positive.

 

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