Coupled reactions: nonspontaneous reaction (ΔG° > 0) + spontaneous reaction (ΔG° < 0)
- results in the nonspontaneous reaction being driven forward
In thermochemistry, a "coupled reaction" is based on the concept that:
a. the enthalpy and entropy of a reaction are interdependent ("coupled") on each other.
b. a nonstandard-state reaction can be "coupled" with a standard-state reaction to result in a spontaneous process (negative ΔG).
c. a thermodynamically favorable reaction can be used to drive a thermodynamically unfavorable reaction by "coupling" the two reactions together simultaneously.
d. "like dissolves like" and "opposites attract".
e. all reactions reach a thermodynamic equilibrium ("coupling") at a specific set of conditions.
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