Advertisements
Advertisements
Question
Arrhenius equation can be represented graphically as follows:
The (i) intercept and (ii) slope of the graph are:
Options
(i) ln A (ii) Ea/R
(i) A (ii) Ea
(i) ln A (ii) - Ea/R
(i) A (ii) - Ea
Advertisements
Solution
(i) ln A (ii) - Ea/R
Explanation:
According to Arrhenius equations,
`k = A exp (- (Ea)/(RT))`
Taking ln on both sides
`l n k = l n A - (Ea)/(RT)`
Or `l n K = (- (Ea)/R) 1/T + l n A`
Comparing the above equations with the equation of straight line y = mx + C, we got
m = `(-Ea)/R`
C = `l n A`
APPEARS IN
RELATED QUESTIONS
The rate constant for the decomposition of hydrocarbons is 2.418 × 10−5 s−1 at 546 K. If the energy of activation is 179.9 kJ/mol, what will be the value of pre-exponential factor?
In the Arrhenius equation for a first order reaction, the values of ‘A’ of ‘Ea’ are 4 × 1013 sec−1 and 98.6 kJ mol−1 respectively. At what temperature will its half life period be 10 minutes?
[R = 8.314 J K−1 mol−1]
Calculate activation energy for a reaction of which rate constant becomes four times when temperature changes from 30 °C to 50 °C. (Given R = 8.314 JK−1 mol−1).
A first-order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. (Given : log 2 = 0·3010, log 4 = 0·6021, R = 8·314 JK–1 mol–1)
Explain the following terms :
Half life period of a reaction (t1/2)
Thermodynamic feasibility of the reaction alone cannot decide the rate of the reaction. Explain with the help of one example.
The activation energy in a chemical reaction is defined as ______.
The slope of Arrhenius Plot `("In" "k" "v"//"s" 1/"T")` of first-order reaction is −5 × 103 K. The value of Ea of the reaction is. Choose the correct option for your answer. [Given R = 8.314 JK−1mol−1]
Which plot of ln k vs `1/T` is consistent with the Arrhenius equation?
Assertion (A): A reaction can have zero activation energy.
Reason (R): The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to the threshold value is called activation energy.
In the light of the above statements, choose the correct answer from the options given below:
