Endergonic reactions can be achieved if they are either " pulled " or " pushed " by an exergonic ( stability increasing, negative change in free energy ) process.
12.
The input of heat into an inherently endergonic reaction, such as the elimination of cyclohexanol to cyclohexene, can be seen as coupling an unfavourable reaction ( elimination ) to a favourable one ( burning of coal or other provision of heat ) such that the total entropy change of the universe is greater than or equal to zero, making the " total"
