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Enthalpy of Activation Calculator

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✖Activation Energy is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation.ⓘ Activation Energy [E_a]			+10% -10%
✖Change in No of Moles of Gas from Rct to AC is defined as the change in the stoichiometric number of molecules going from reactant to activated complex.ⓘ Change in No of Moles of Gas from Rct to AC [Δn_g]			+10% -10%
✖Temperature is the degree or intensity of heat present in a substance or object.ⓘ Temperature [T]			+10% -10%

✖Enthalpy of activation is approximately equal to the activation energy; the conversion of one into the other depends on the molecularity.ⓘ Enthalpy of Activation [H_Activation]

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Enthalpy of Activation Solution

STEP 0: Pre-Calculation Summary

Formula Used

Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature))
H_Activation = (E_a-(Δn_g*[Molar-g]*T))
This formula uses 1 Constants, 4 Variables

Constants Used

[Molar-g] - Molar gas constant Value Taken As 8.3145

Variables Used

Enthalpy of Activation - (Measured in Joule Per Mole) - Enthalpy of activation is approximately equal to the activation energy; the conversion of one into the other depends on the molecularity.
Activation Energy - (Measured in Joule Per Mole) - Activation Energy is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation.
Change in No of Moles of Gas from Rct to AC - Change in No of Moles of Gas from Rct to AC is defined as the change in the stoichiometric number of molecules going from reactant to activated complex.
Temperature - (Measured in Kelvin) - Temperature is the degree or intensity of heat present in a substance or object.

STEP 1: Convert Input(s) to Base Unit

Activation Energy: 334 Joule Per Mole --> 334 Joule Per Mole No Conversion Required
Change in No of Moles of Gas from Rct to AC: 3 --> No Conversion Required
Temperature: 85 Kelvin --> 85 Kelvin No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

H_Activation = (E_a-(Δn_g*[Molar-g]*T)) --> (334-(3*[Molar-g]*85))

Evaluating ... ...

H_Activation = -1786.1975

STEP 3: Convert Result to Output's Unit

-1786.1975 Joule Per Mole --> No Conversion Required

FINAL ANSWER

-1786.1975 Joule Per Mole <-- Enthalpy of Activation

(Calculation completed in 00.020 seconds)

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< Transition State Theory Calculators

Rate Constant of Reaction by Erying Equation

LaTeX Go Rate Constant = ([BoltZ]*Temperature*exp(Entropy of Activation/[Molar-g])*exp(-Enthalpy of Activation/[Molar-g]*Temperature))/[hP]

Entropy of Activation

LaTeX Go Entropy of Activation = ([Molar-g]*ln(Pre-Exponential Factor))-[Molar-g]*ln([Molar-g]*Temperature)/[Avaga-no]*[hP]

Enthalpy of Activation

LaTeX Go Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature))

Enthalpy of Activation Given Slope of line

LaTeX Go Enthalpy of Activation = -(Slope of Line B/w Ln K and 1/T*2.303*[Molar-g])

Enthalpy of Activation Formula

LaTeX Go

Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature))
H_Activation = (E_a-(Δn_g*[Molar-g]*T))

What is Transition State Theory ?

Transition state theory explains the reaction rates of elementary chemical reactions. The theory assumes a special type of chemical equilibrium (quasi-equilibrium) between reactants and activated transition state complexes.

How to Calculate Enthalpy of Activation?

Enthalpy of Activation calculator uses Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature)) to calculate the Enthalpy of Activation, Enthalpy of activation is approximately equal to the activation energy; the conversion of one into the other depends on the molecularity. It is the enthalpy change that appears in the thermodynamic form of the rate equation obtained from conventional transition state theory. This equation is only correct for a first order reaction, for which the rate constant has the dimension reciprocal time. Enthalpy of Activation is denoted by H_Activation symbol.

How to calculate Enthalpy of Activation using this online calculator? To use this online calculator for Enthalpy of Activation, enter Activation Energy (E_a), Change in No of Moles of Gas from Rct to AC (Δn_g) & Temperature (T) and hit the calculate button. Here is how the Enthalpy of Activation calculation can be explained with given input values -> -1786.1975 = (334-(3*[Molar-g]*85)).

FAQ

What is Enthalpy of Activation?

Enthalpy of activation is approximately equal to the activation energy; the conversion of one into the other depends on the molecularity. It is the enthalpy change that appears in the thermodynamic form of the rate equation obtained from conventional transition state theory. This equation is only correct for a first order reaction, for which the rate constant has the dimension reciprocal time and is represented as H_Activation = (E_a-(Δn_g*[Molar-g]*T)) or Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature)). Activation Energy is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation, Change in No of Moles of Gas from Rct to AC is defined as the change in the stoichiometric number of molecules going from reactant to activated complex & Temperature is the degree or intensity of heat present in a substance or object.

How to calculate Enthalpy of Activation?

Enthalpy of activation is approximately equal to the activation energy; the conversion of one into the other depends on the molecularity. It is the enthalpy change that appears in the thermodynamic form of the rate equation obtained from conventional transition state theory. This equation is only correct for a first order reaction, for which the rate constant has the dimension reciprocal time is calculated using Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature)). To calculate Enthalpy of Activation, you need Activation Energy (E_a), Change in No of Moles of Gas from Rct to AC (Δn_g) & Temperature (T). With our tool, you need to enter the respective value for Activation Energy, Change in No of Moles of Gas from Rct to AC & Temperature and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Enthalpy of Activation?

In this formula, Enthalpy of Activation uses Activation Energy, Change in No of Moles of Gas from Rct to AC & Temperature. We can use 1 other way(s) to calculate the same, which is/are as follows -

Enthalpy of Activation = -(Slope of Line B/w Ln K and 1/T*2.303*[Molar-g])

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