Chemical Kinetics

For a reaction of order n, the unit of the rate constant is:

If the activation energy of a reaction is 80.9 kJ mol^-1, the fraction of molecules at 700K, having enough energy to react to form products, is e^-x. The value of x is………. (Rounded-off to the nearest integer).

[use R = 8.31 J K^-1 mol^-1]

Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half – life of 3.33 h at 25°C. After 9h, the fraction of sucrose remaining is f. The value of log₁₀ $\left(\frac{1}{f}\right)$  is………………….* 10^-2. (Rounded off to the nearest integer)

[Assume: In 10 = 2.303, In2 = 0.693]

For the reaction aA + bB->cC + dD, the plot of log K vs $\frac{1}{T}$  is given below:

This temperature at which the rate constant of the reaction is 10^-4 s^-1 is----------K.

(Rounded – off to the nearest integer)

[Given : The rate constant of the reaction is 10^-5 s^-1 at 500 K]

Benzene on nitration givens nitrobenzene in presence of HNO₃ and H₂SO₄ mixture, where:

For the reaction A -> B, the rate constant K(in s^-1) is givne by

$lo{g}_{10}K=20.35-\frac{\left(2.47*10^3\right)}{T}.$

The energy of activation in KJ mol^-1 is ______. (Nearest integer)

[Given : R = 8.314 J K^-1 mol^-1]

At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340s. When the pressure was 27.8 kPa., the half life was found to be 170s. The order of the reaction is ________. [integer answer]

[A]               ->                     [B]

Reactant                         Product

If formation of compound [B] follows the first order of kinetics and after 70 minutes the concentration of [A] was found to be half of its initial concentration. Then the rate constant of the reaction is x * 10^-6 s^-1. The value of x is___________. (Nearest Integer)

The half life for the decomposition of gaseous compound A is 240s when the gaseous pressure was 500 Torr initially, When the pressure was 250 Torr, the half life was found to be 4.0 min. The order of the reaction is _________. (Nearest integer)

For the given first order reaction

A -> B

The half life of the reaction is 0.3010 min. The ration of the initial concentration of reactant to the concentration of reactant at time 2.0 min will be equal to________________. (Nearest integer)