Table of Contents
What is Heat of Reaction?
Heat of Reaction – Definition: The heat of reaction is the amount of energy that is released or absorbed during a chemical reaction. This energy can be in the form of heat, light, or electricity. The heat of reaction is usually measured in kilojoules per mole (kJ/mol) or in calories per mole (cal/mol).
Enthalpy of Reaction
The enthalpy of reaction is the heat energy released or absorbed during a chemical reaction. It is a measure of the change in energy of the system. The enthalpy of reaction can be positive or negative.
Symbol for Heat
The symbol for heat is “Q.” Heat is the energy that is transferred between two systems because of a temperature difference. Heat is measured in Joules.
Heat of Reaction Formula
The heat of reaction is the amount of heat that is released or absorbed during a chemical reaction. This is typically measured in kilojoules per mole (kJ/mol). The heat of reaction can be used to determine the equilibrium constant of a reaction, as well as the heat of formation of a compound.
Enthalpy of Reaction (Exothermic and Endothermic)
- An exothermic reaction is a chemical reaction that releases energy in the form of heat. The enthalpy of reaction for an exothermic reaction is negative. This means that the reaction releases more energy than it requires to start the reaction.
- An endothermic reaction is a chemical reaction that consumes energy in the form of heat. The enthalpy of reaction for an endothermic reaction is positive. This means that the reaction consumes more energy than it releases.
Standard Heat of Reaction
The standard heat of reaction (ΔH) is the heat released or absorbed when a chemical reaction occurs under standard conditions. The standard conditions are 1 atm pressure and 25°C.
