Describe how does the enthalpy of reaction remain unchanged when a catalyst is used in the reaction?

Describe how does the enthalpy of reaction remain unchanged when a cat

1.	Describe how does the enthalpy of reaction remain unchanged when a catalyst is used in the reaction?
Answer» Solution : A catalyst is a substance which increases the speed of a reaction without itself undergoing any chemical change. According to "intermediate complex formation thoory" reaciants firstcombinewith the catalyst to form an intermedieate complex which isshort-lived and decomposes to form the products and regenerating the catalyst. The intermediate formed has much lower potential energy than the intermediate complex formed between the reactants in the absence of the catalyst. Thus the presence of catalyst lowers the potential energy barrier and the reaction FOLLOWS a new ALTERNATE PATHWAY which require less activation energy. We know that,lower the activationenergy,faster is thereactionbecause morereactantmoleules can cross theenergybarrier andchanger into products . Enthalpy,`DeltaH`is a state functions.Enthalpyof reactions,i.e.,DIFFERECE inenergy between reactants and PRODUCT isconstant,whichis clear formpotential energy diagram. Potential energydiagramof catalysed reaction isgivenas