This activation energy calculator (also called the Arrhenius equation calculator) can help you calculate the minimum energy required for a chemical reaction to happen. For example, you may want to know what is the energy needed to light a match. This article will provide you with the most important information - that is how to calculate the activation energy using the Arrhenius equation, as well as what is the definition and units of activation energy.
Activation energy is the energy required for a chemical reaction to occur. You can picture it as a threshold energy level; if you don't supply this amount of energy, the reaction will not take place.
Activation energy is required for many types of reactions, for example for combustion. Every time you want to light a match, you need to supply energy (in this example in the form of rubbing the match against the matchbox). That's why your matches don't combust spontaneously. This is the same principle that was valid in the times of stone age - flint and steel were used to produce friction and hence sparks.
You can find the activation energy for any reactant using the Arrhenius equation:
Eₐ = -R * T * ln(k/A)
The most commonly used units of activation energy are joules per mol (J/mol). You can convert them to SI units in the following way:
1 J/mol = 1 (kg * m² / s²) / mol = 1 (kg * m²) / (s² * mol)
A = 9.4*10⁹ 1/sec.