Enthalpy of Chemical Reaction Calculator

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✖Activation Energy Forward is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation in a forward reaction.ⓘ Activation Energy Forward [E_af]			+10% -10%
✖Activation Energy Backward is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation for a backward reaction.ⓘ Activation Energy Backward [E_ab]			+10% -10%

✖The Enthalpy of Reaction is the difference in enthalpy between products and reactants.ⓘ Enthalpy of Chemical Reaction [ΔH]

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Formula

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Enthalpy of Chemical Reaction

Formula

`"ΔH" = "E"_{"af"}-"E"_{"ab"}`

Example

`"-1.6E^-20KJ/mol"="150eV"-"250eV"`

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Enthalpy of Chemical Reaction Solution

STEP 0: Pre-Calculation Summary

Formula Used

Enthalpy of Reaction = Activation Energy Forward-Activation Energy Backward
ΔH = E_af-E_ab
This formula uses 3 Variables

Variables Used

Enthalpy of Reaction - (Measured in Joule Per Mole) - The Enthalpy of Reaction is the difference in enthalpy between products and reactants.
Activation Energy Forward - (Measured in Joule) - Activation Energy Forward is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation in a forward reaction.
Activation Energy Backward - (Measured in Joule) - Activation Energy Backward is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation for a backward reaction.

STEP 1: Convert Input(s) to Base Unit

Activation Energy Forward: 150 Electron-Volt --> 2.40326599500001E-17 Joule (Check conversion here)
Activation Energy Backward: 250 Electron-Volt --> 4.00544332500002E-17 Joule (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ΔH = E_af-E_ab --> 2.40326599500001E-17-4.00544332500002E-17

Evaluating ... ...

ΔH = -1.60217733000001E-17

STEP 3: Convert Result to Output's Unit

-1.60217733000001E-17 Joule Per Mole -->-1.60217733000001E-20 KiloJoule Per Mole (Check conversion here)

FINAL ANSWER

-1.60217733000001E-20 ≈ -1.6E-20 KiloJoule Per Mole <-- Enthalpy of Reaction

(Calculation completed in 00.004 seconds)

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National Institute of Information Technology (NIIT), Neemrana

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< 20 Arrhenius Equation Calculators

Pre-Exponential Factor for Backward Reaction using Arrhenius equation

Go Backward Pre-exponential factor = ((Forward Pre-exponential Factor*Backward Reaction Rate Constant)/Forward reaction rate constant)*exp((Activation Energy Backward-Activation Energy Forward)/([R]*Absolute Temperature))

Pre-Exponential Factor for Forward Reaction using Arrhenius Equation

Go Forward Pre-exponential Factor = (Forward reaction rate constant*Backward Pre-exponential factor)/(Backward Reaction Rate Constant*exp((Activation Energy Backward-Activation Energy Forward)/([R]*Absolute Temperature)))

Backward Reaction Rate Constant using Arrhenius Equation

Go Backward Reaction Rate Constant = (Forward reaction rate constant*Backward Pre-exponential factor)/(Forward Pre-exponential Factor*exp((Activation Energy Backward-Activation Energy Forward)/([R]*Absolute Temperature)))

Forward Reaction Rate Constant using Arrhenius Equation

Go Forward reaction rate constant = ((Forward Pre-exponential Factor*Backward Reaction Rate Constant)/Backward Pre-exponential factor)*exp((Activation Energy Backward-Activation Energy Forward)/([R]*Absolute Temperature))

Enthalpy of Chemical Reaction at Absolute Temperatures

Go Enthalpy of Reaction = log10(Equilibrium constant 2/Equilibrium constant 1)*(2.303*[R])*((Absolute Temperature*Absolute temperature 2)/(Absolute temperature 2-Absolute Temperature))

Enthalpy of Chemical Reaction using Equilibrium Constants

Go Enthalpy of Reaction = -(log10(Equilibrium constant 2/Equilibrium constant 1)*[R]*((Absolute Temperature*Absolute temperature 2)/(Absolute Temperature-Absolute temperature 2)))

Equilibrium Constant at Temperature T2

Go Equilibrium constant 2 = (Forward Pre-exponential Factor/Backward Pre-exponential factor)*exp((Activation Energy Backward-Activation Energy Forward)/([R]*Absolute temperature 2))

Equilibrium Constant at Temperature T1

Go Equilibrium constant 1 = (Forward Pre-exponential Factor/Backward Pre-exponential factor)*exp((Activation Energy Backward-Activation Energy Forward)/([R]*Absolute Temperature))

Equilibrium Constant using Arrhenius Equation

Go Equilibrium Constant = (Forward Pre-exponential Factor/Backward Pre-exponential factor)*exp((Activation Energy Backward-Activation Energy Forward)/([R]*Absolute Temperature))

Equilibrium Constant 2 using Activation Energy of Reaction

Go Equilibrium constant 2 = Equilibrium constant 1*exp(((Activation Energy Backward-Activation Energy Forward)/[R])*((1/Absolute temperature 2)-(1/Absolute Temperature)))

Equilibrium Constant 2 using Enthalpy of Reaction

Go Equilibrium constant 2 = Equilibrium constant 1*exp((-(Enthalpy of Reaction/[R]))*((1/Absolute temperature 2)-(1/Absolute Temperature)))

Pre-exponential Factor in Arrhenius Equation for Backward Reaction

Go Backward Pre-exponential factor = Backward Reaction Rate Constant/exp(-(Activation Energy Backward/([R]*Absolute Temperature)))

Arrhenius Equation for Backward Equation

Go Backward Reaction Rate Constant = Backward Pre-exponential factor*exp(-(Activation Energy Backward/([R]*Absolute Temperature)))

Pre-exponential Factor in Arrhenius Equation for Forward Reaction

Go Forward Pre-exponential Factor = Forward reaction rate constant/exp(-(Activation Energy Forward/([R]*Absolute Temperature)))

Arrhenius Equation for Forward Reaction

Go Forward reaction rate constant = Forward Pre-exponential Factor*exp(-(Activation Energy Forward/([R]*Absolute Temperature)))

Arrhenius Equation

Go Rate Constant = Pre-Exponential Factor*(exp(-(Activation Energy/([R]*Absolute Temperature))))

Pre-exponential Factor in Arrhenius Equation

Go Pre-Exponential Factor = Rate Constant/exp(-(Activation Energy/([R]*Absolute Temperature)))

Activation Energy for Backward Reaction

Go Activation Energy Backward = Activation Energy Forward-Enthalpy of Reaction

Activation Energy for Forward Reaction

Go Activation Energy Forward = Enthalpy of Reaction+Activation Energy Backward

Enthalpy of Chemical Reaction

Go Enthalpy of Reaction = Activation Energy Forward-Activation Energy Backward

Enthalpy of Chemical Reaction Formula

Enthalpy of Reaction = Activation Energy Forward-Activation Energy Backward
ΔH = E_af-E_ab

What do you mean by activation energy?

Activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport. In transition-state theory, the activation energy is the difference in energy content between atoms or molecules in an activated or transition-state configuration and the corresponding atoms and molecules in their initial configuration. The activation energy is usually represented by the symbol Ea in mathematical expressions for such quantities as the reaction rate constant, k.

How to Calculate Enthalpy of Chemical Reaction?

Enthalpy of Chemical Reaction calculator uses Enthalpy of Reaction = Activation Energy Forward-Activation Energy Backward to calculate the Enthalpy of Reaction, The Enthalpy of chemical reaction formula is defined as the difference in activation energy between products and reactants for forward and backward reactions. Enthalpy of Reaction is denoted by ΔH symbol.

How to calculate Enthalpy of Chemical Reaction using this online calculator? To use this online calculator for Enthalpy of Chemical Reaction, enter Activation Energy Forward (E_af) & Activation Energy Backward (E_ab) and hit the calculate button. Here is how the Enthalpy of Chemical Reaction calculation can be explained with given input values -> -1.6E-23 = 2.40326599500001E-17-4.00544332500002E-17.

FAQ

What is Enthalpy of Chemical Reaction?

The Enthalpy of chemical reaction formula is defined as the difference in activation energy between products and reactants for forward and backward reactions and is represented as ΔH = E_af-E_ab or Enthalpy of Reaction = Activation Energy Forward-Activation Energy Backward. Activation Energy Forward is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation in a forward reaction & Activation Energy Backward is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation for a backward reaction.

How to calculate Enthalpy of Chemical Reaction?

The Enthalpy of chemical reaction formula is defined as the difference in activation energy between products and reactants for forward and backward reactions is calculated using Enthalpy of Reaction = Activation Energy Forward-Activation Energy Backward. To calculate Enthalpy of Chemical Reaction, you need Activation Energy Forward (E_af) & Activation Energy Backward (E_ab). With our tool, you need to enter the respective value for Activation Energy Forward & Activation Energy Backward 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 Reaction?

In this formula, Enthalpy of Reaction uses Activation Energy Forward & Activation Energy Backward. We can use 2 other way(s) to calculate the same, which is/are as follows -

Enthalpy of Reaction = log10(Equilibrium constant 2/Equilibrium constant 1)*(2.303*[R])*((Absolute Temperature*Absolute temperature 2)/(Absolute temperature 2-Absolute Temperature))
Enthalpy of Reaction = -(log10(Equilibrium constant 2/Equilibrium constant 1)*[R]*((Absolute Temperature*Absolute temperature 2)/(Absolute Temperature-Absolute temperature 2)))

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