- Endothermic rxn absorbs heat from the surroundings.
- Exothermic rxn releases heat to the surroundings.
!!! If exothermic in the forward direction, then its exothermic is in the backward direction.
Le Chatelier's Principle : Increasing the temp shifts the equilirbium in the endothermic direction so the heat is absorbed & temp is reduced. Decreasing the temp shifts the equilibrium in the exothermic direction which releases heat to the surroundings.
1. 2NO2 (g) <---> N2O4 (g) Enthalpy change of rxn, H = - 24kJmol-1
Forward direction is exothermic ; Backward direction is endothermic.
When temp of equilibrium mixture is raised…