Table of Contents
An Introduction to Heat of Formation ;
The heat of formation of a compound is the amount of heat released or absorbed when the compound is formed from its constituent elements. The heat of formation is usually given in kilojoules per mole (kJ/mol).
The heat of formation can be used to calculate the enthalpy of reaction for a chemical reaction. The enthalpy of reaction is the change in enthalpy that occurs when a chemical reaction takes place.
Standard Enthalpy of Formation
Standard enthalpy of formation (enthalpy of formation) is the enthalpy change associated with the formation of one mole of a substance from its component elements in their standard states. Standard enthalpy of formation is denoted by ΔH f °. The standard state of a substance is a state at a pressure of 1 bar and a temperature of 298.15 K.
Define Standard Enthalpy of Formation
Standard Enthalpy of Formation (ΔHf) is the enthalpy change that occurs when one mole of a compound is formed from its component elements in their standard states. The standard state of an element is defined as the element in its most stable form at 1 bar of pressure and 298 K (25 degrees Celsius).
What is Heat of Formation?
The heat of formation is the amount of heat energy released or absorbed when a substance is formed from its component elements. The heat of formation is usually expressed in kilojoules per mole (kJ/mol).
The Heat of Formation Formula
The standard heat of formation formula is used to calculate the standard enthalpy change of a reaction. The standard enthalpy change of formation is the enthalpy change that occurs when one mole of a reactant is formed from its elements in their standard states.
The standard heat of formation formula is:
ΔH = [Σ(Hproducts) – (Σ(Hreactants))]
Where:
ΔH = Standard enthalpy change of formation
Hproducts = Enthalpy of the products
Hreactants = Enthalpy of the reactants
