Question

Explain The enthalpy of reaction with suitable example.

Answer 1

Enthalpy change is defined by the following equation: ΔH is the "enthalpy change", ... If ΔH is positive, the reaction is endothermic, that is heat is absorbed by the system due to the products of the reaction having a greater enthalpy than the reactants.

Answer 2

Enthalpyy of reaction is the change in enthalpy that accompanies a chemical reaction represented by a balanced equation.

The factors responsible for the enthalpy of reaction are :-

1. Physical state of reactants and products.
2. Allotropic modifications of reactants.
3. Standard temperature and pressure.
4. Constant temperature and pressure.
5. Quantity of reactants.

Different types of enthalpy of reactions are :

1. Enthalpy of combustion of carbon (∆cH).
2. Enthalpy of carbon dioxide formation reaction (∆fH)