Enthalpy of Activation Given Slope of line Calculator

Enthalpy of Activation Formula:

\[ H_{Activation} = -(m_{slope} \times 2.303 \times [Molar-g]) \]

Enthalpy of Activation (J/mol):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Enthalpy of Activation?

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

Purpose: It helps in understanding the energy barrier that must be overcome for a chemical reaction to occur.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ H_{Activation} = -(m_{slope} \times 2.303 \times [Molar-g]) \]

Where:

\( H_{Activation} \) — Enthalpy of activation (J/mol)
\( m_{slope} \) — Slope of Line B/w Ln K and 1/T (K)
\( [Molar-g] \) — Molar gas constant (8.3145 J/mol·K)

Explanation: The slope from an Arrhenius plot (ln K vs 1/T) is used to calculate the enthalpy of activation.

3. Importance of Enthalpy of Activation

Details: This value helps predict reaction rates and understand the temperature dependence of chemical reactions.

4. Using the Calculator

Tips: Enter the slope obtained from plotting ln(rate constant) versus inverse temperature (1/T in Kelvin).

5. Frequently Asked Questions (FAQ)

Q1: How is the slope obtained?
A: From an Arrhenius plot where ln(rate constant) is plotted against 1/T (inverse temperature in Kelvin).

Q2: What's the value of the molar gas constant?
A: The calculator uses 8.3145 J/mol·K as the molar gas constant.

Q3: What does a negative slope indicate?
A: A negative slope is normal and indicates the inverse relationship between rate constant and temperature.

Q4: How does this relate to activation energy?
A: For unimolecular reactions, enthalpy of activation ≈ activation energy - RT.

Q5: What units should the slope be in?
A: The slope should be in Kelvin (K) units.