FormulaDen.com

Physics Chemistry Math Chemical Engineering Civil Electrical Electronics Electronics and Instrumentation Materials Science Mechanical Production Engineering Financial Health

Enthalpy of Activation Formula

GoEnthalpy of Activation Given Slope of line Formula

Fx Copy

LaTeX Copy

Enthalpy of activation is approximately equal to the activation energy; the conversion of one into the other depends on the molecularity. Check FAQs

H Activation = (E a - (Δn g \cdot [Molar-g] \cdot T))

H_Activation - Enthalpy of Activation?E_a - Activation Energy?Δn_g - Change in No of Moles of Gas from Rct to AC?T - Temperature?[Molar-g] - Molar gas constant?

Enthalpy of Activation Example

With values

With units

Only example

Here is how the Enthalpy of Activation equation looks like with Values.

Here is how the Enthalpy of Activation equation looks like with Units.

Here is how the Enthalpy of Activation equation looks like.

-1786.1975 = (334 - (3 \cdot 8.3145 \cdot 85))

-1786.1975J/mol = (334J/mol - (3 \cdot 8.3145J/K*mol \cdot 85K))

-1786.1975 = (334 - (3 \cdot 8.3145 \cdot 85))

Tip: Use pencil ( Pencil

) icon above to edit Input Values and Units.

Calculate

Recalculate

Solution

Copy

Reset

You are here -

Home » Category

Chemistry » Category

Chemical Kinetics » Category

Transition State Theory » fx Enthalpy of Activation

Enthalpy of Activation Solution

Follow our step by step solution on how to calculate Enthalpy of Activation?

FIRST Step Consider the formula

H Activation = (E a - (Δn g \cdot [Molar-g] \cdot T))

Next Step Substitute values of Variables

∴

H Activation = (334J/mol - (3 \cdot [Molar-g] \cdot 85K))

Next Step Substitute values of Constants

∴

H Activation = (334J/mol - (3 \cdot 8.3145J/K*mol \cdot 85K))

Next Step Prepare to Evaluate

∴

H Activation = (334 - (3 \cdot 8.3145 \cdot 85))

LAST Step Evaluate

∴

H Activation = -1786.1975J/mol

Enthalpy of Activation Formula Elements

Variables

Constants

Enthalpy of Activation

Enthalpy of activation is approximately equal to the activation energy; the conversion of one into the other depends on the molecularity.

Symbol: H_Activation

Measurement: Energy Per MoleUnit: J/mol

Note: Value can be positive or negative.

Formulas to find Enthalpy of Activation

Activation Energy

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.

Symbol: E_a

Measurement: Energy Per MoleUnit: J/mol

Note: Value can be positive or negative.

Formulas to find Activation Energy

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.

Symbol: Δn_g

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Change in No of Moles of Gas from Rct to AC

Temperature

Temperature is the degree or intensity of heat present in a substance or object.

Symbol: T

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Temperature

Molar gas constant

Molar gas constant is a fundamental physical constant that relates the energy of a mole of particles to the temperature of a system.

Symbol: [Molar-g]

Value: 8.3145 J/K*mol

Other Formulas to find Enthalpy of Activation

Go Enthalpy of Activation Given Slope of line

H Activation = - (m slope \cdot 2.303 \cdot [Molar-g])

Other formulas in Transition State Theory category

Go Rate Constant of Reaction by Erying Equation

k = \frac{[BoltZ] \cdot T \cdot \exp (\frac{S Activation}{[Molar-g]}) \cdot \exp (- \frac{H Activation}{[Molar-g]} \cdot T)}{[hP]}

Go Entropy of Activation

S Activation = ([Molar-g] \cdot \ln (A)) - [Molar-g] \cdot \frac{\ln ([Molar-g] \cdot T)}{[Avaga-no]} \cdot [hP]

Go Thermodynamic Equilibrium Constant

K = e^{\frac{ΔG}{[Molar-g] \cdot T}}

How to Evaluate Enthalpy of Activation?

Enthalpy of Activation evaluator uses Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature)) to evaluate 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 evaluate Enthalpy of Activation using this online evaluator? To use this online evaluator 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.

FAQs on Enthalpy of Activation

What is the formula to find Enthalpy of Activation?

The formula of Enthalpy of Activation is expressed as Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature)). Here is an example- -1786.1975 = (334-(3*[Molar-g]*85)).

How to calculate Enthalpy of Activation?

With Activation Energy (E_a), Change in No of Moles of Gas from Rct to AC (Δn_g) & Temperature (T) we can find Enthalpy of Activation using the formula - Enthalpy of Activation = (Activation Energy-(Change in No of Moles of Gas from Rct to AC*[Molar-g]*Temperature)). This formula also uses Molar gas constant .

What are the other ways to Calculate Enthalpy of Activation?

Here are the different ways to Calculate Enthalpy of Activation-

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

Can the Enthalpy of Activation be negative?

Yes, the Enthalpy of Activation, measured in Energy Per Mole can be negative.

Which unit is used to measure Enthalpy of Activation?

Enthalpy of Activation is usually measured using the Joule Per Mole[J/mol] for Energy Per Mole. KiloJoule Per Mole[J/mol], Kilocalorie Per Mole[J/mol] are the few other units in which Enthalpy of Activation can be measured.

Let Others Know

✖

Facebook

Twitter

Copied!

: Value
: Unit

Enthalpy of Activation Formula

​GoEnthalpy of Activation Given Slope of line Formula

Enthalpy of Activation Example

Enthalpy of Activation Solution

Enthalpy of Activation Formula Elements

Other Formulas to find Enthalpy of Activation

Other formulas in Transition State Theory category

How to Evaluate Enthalpy of Activation?

FAQs on Enthalpy of Activation

Variable Name

GoEnthalpy of Activation Given Slope of line Formula