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18
Temperature
changes
•In order to know how
temperature affects an equilibrium
mixture, you have to be given the DH for
the reaction.
N2(g) + 3 H2(g) 2 NH3(g) DH =
–91.8 kJ
•
•When
temperature is increased by adding heat, the reaction will try to remove the added heat by moving in the endothermic
direction.
•When
temperature is decreased by removing heat, the reaction will try to replaced the removed heat by moving in the
exothermic direction.
•These directions are determined by the sign on DH .
