The activation energy for the decomposition of HI(g) to H2(g) and I2(g) is 186 kJ/mol. The rate constant at 555K is 3.52×10-7 L/mol.
How do you find the activation energy of decomposition?
Solution
- Step 1: Convert temperatures from degrees Celsius to Kelvin. T = degrees Celsius + 273.15. T1 = 3 + 273.15.
- Step 2 – Find Ea ln(k2/k1) = Ea/R x (1/T1 – 1/T2) ln(7.1 x 10-2/8.9 x 10-3) = Ea/8.3145 J/K·mol x (1/276.15 K – 1/308.15 K)
- Answer: The activation energy for this reaction is 4.59 x 104 J/mol or 45.9 kJ/mol.
What is the activation energy for a reaction if it’s?
The activation energy for the forward reaction is the amount of free energy that must be added to go from the energy level of the reactants to the energy level of the transition state.
What is EA in Arrhenius equation?
It is also often called the frequency factor. A represents the number of collisions per second with the proper orientation to react, and the e^(-Ea/RT) term represents the probability that a given collision will result in a reaction. Comment on Ernest Zinck’s post “In the Arrhenius equation, k = Ae^(-Ea/RT), A is o…”
How do you find the activation energy for the Arrhenius equation?
Determining Activation Energy. Notice that when the Arrhenius equation is rearranged as above it is a linear equation with the form y = mx + b; y is ln(k), x is 1/T, and m is -Ea/R. The activation energy for the reaction can be determined by finding the slope of the line.
How is activation energy measured experimentally?
Rate data as a function of temperature, fit to the Arrhenius equation, will yield an estimate of the activation energy. From the Arrhenius equation, a plot of ln(k) vs. 1/T will have a slope (m) equal to Ea/R. R in this case should match the units of activation energy, R= 8.314 J/(K mol).
What is positive catalyst give example?
A positive catalyst, or just catalyst for short, are substances that help hasten a chemical reaction. Some typical examples include biological catalysts Amylase, Maltase, Protease, and Lipase; as well as popular chemicals like sulfuric acid and manganese dioxide.