## 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))
ΔH* = (Ea-(Δng*[Molar-g]*T))
This formula uses 1 Constants, 4 Variables
Constants Used
[Molar-g] - Molar gas constant Value Taken As 8.3145 Joule/Kelvin Mole
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
ΔH* = (Ea-(Δng*[Molar-g]*T)) --> (334-(3*[Molar-g]*85))
Evaluating ... ...
ΔH* = -1786.1975
STEP 3: Convert Result to Output's Unit
-1786.1975 Joule Per Mole -->-1.7861975 KiloJoule Per Mole (Check conversion here)
-1.7861975 KiloJoule Per Mole <-- Enthalpy of Activation
(Calculation completed in 00.016 seconds)
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University of Calcutta (CU), Kolkata
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## < 5 Transition State Theory Calculators

Rate Constant of Reaction by Erying Equation
Rate Constant = ([BoltZ]*Temperature*exp(Entropy of Activation/[Molar-g])*exp(-Enthalpy of Activation/[Molar-g]*Temperature))/[hP] Go
Entropy of Activation
Entropy of Activation = ([Molar-g]*ln(Pre-Exponential Factor))-[Molar-g]*ln([Molar-g]*Temperature)/[Avaga-no]*[hP] Go
Enthalpy of Activation
Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature)) Go
Thermodynamic Equilibrium Constant
Thermodynamic Equillibrium Constant = e^(Change in Free Energy/([Molar-g]*Temperature)) Go
Enthalpy of Activation Given Slope of line
Enthalpy of Activation = -(Slope of Line B/w Ln K and 1/T*2.303*[Molar-g]) Go

## Enthalpy of Activation Formula

Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature))
ΔH* = (Ea-(Δng*[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 ΔH* symbol.

How to calculate Enthalpy of Activation using this online calculator? To use this online calculator for Enthalpy of Activation, enter Activation Energy (Ea), Change in No of Moles of Gas from Rct to AC (Δng) & Temperature (T) and hit the calculate button. Here is how the Enthalpy of Activation calculation can be explained with given input values -> -1.786198 = (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 ΔH* = (Ea-(Δng*[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 (Ea), Change in No of Moles of Gas from Rct to AC (Δng) & 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.
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