Take the help of Arrhenius Equation calculator tool to know the rate constant in a fraction of seconds easily. Just you have to give inputs ie.arrhenius constant, activation energy, temperature and tap on the calculate button to get the result of rate constant quickly.
Arrhenius Equation Calculator: Do you need assistance to calculate the rate of reaction? The arrhenius equation is useful to know how the rate of reaction changes by changing the temperature.While calculating the rate of reaction for small molecules there is a chance of mistakes and is difficult. So take the help of our tool Arrhenius Equation calculator for better understand.Here we will explain what is meant by rate of reaction ,Arrhenius Equation formula, step by step procedure for how to use an arrhenius Equation calculator. Also we have solved and explained a few problems in a step by step process for better understanding.
The Arrhenius equation is an expression that provides a relationship between the rate constant (of a chemical reaction), the absolute temperature, and the A factor (also known as the pre-exponential factor; can be visualised as the frequency of correctly oriented collisions between reactant particles). It provides insight into the dependence of reaction rates on the absolute temperature
If the activation energy is expressed in terms of energy per reactant molecule, the universal gas constant must be replaced with the Boltzmann constant (kB) in the Arrhenius equation.
The Arrhenius equation explains how the rate of a reaction varies based on the temperature or rate constant. The general formula of the Arrhenius equation is K = Ae( - E a / R * T )
When the reaction temperature increases, the number of successful collisions also increases exponentially. The Arrhenius equation in logarithmic form is ln(k) = (-E/R)*(1/T) + ln(A)
Go through the simple steps to find the rate of reaction with the help of Arrhenius Equation
Question 1: The activation energy of a chemical reaction is 100 kJ/mol and it’s A factor is 10 M-1s-1. Find the rate constant of this equation at a temperature of 300 K.
Solution:
Given,
Ea = 100 kJ.mol-1 = 100000 J.mol-1
A = 10 M-1s-1, ln(A) = 2.3 (approx.)
T = 300 K , R = 8.314 J.mol-1.K-1
The value of the rate constant can be obtained from the logarithmic form of the Arrhenius equation, is
ln k = ln(A) – (Ea/RT)
ln k = 2.3 – (100000 J.mol-1)/(8.314 J.mol-1.K-1)*(300K)
ln k = 2.3 – 40.1
ln k = -37.8
k = 3.8341*10-17 M-1s-1 (from the units of the A factor)
Question 2: The activation energy of a chemical reaction is 200 J/mol and it’s A factor is 10 M-1s-1. Find the rate constant of this equation at a temperature of 400 K.
Solution:
Given that,
Ea = 200 kJ.mol-1 = 200000 J.mol-
A = 10 M-1s-1, ln(A) = 2.3 (approx.)
T = 400 K
R = 8.314 J.mol-1.K-1
The logarithmic form of the Arrhenius equation, is
ln k = ln(A) – (Ea/RT)
lnk = 2.3 - ( 200000 / 8.314 * 400)
= 2.3 - ( 200000/3325.6)
= 2.3 - 60.1 = -57.8
k = 5.841*10-17 M-1s-1 (from the units of the A factor)
1. What is activation energy?
It is the minimum energy required for reactants to transform into products. It is denoted by Ea. The SI units for activation energy are joules (J) and or kilo-joules per mole (kJ/mol) or kilo-calories per mole (kcal/mol).
2. What is the importance of the Arrhenius Equation?
The Arrhenius Equation importance is provided here
3. What is kB is Arrhenius Equation?
Arrhenius Equation is k = A x e(-Ea/(kB x T)). Here, kB is the Boltzmann constant and its value is 1.380649 x 10-23 J/K.
4. What is ‘A’ in the Arrhenius Equation?
The symbol ‘A’ is the frequency factor or the Arrhenius factor. It deals with the collisions between molecules and can be thought of as the frequency of correctly oriented collisions between molecules that have sufficient energy to spark a chemical reaction.