Activation energy for the acid catalysed hydrolysis of sucrose is 6.22 kJ `mol^-1`, while the activation energy is only 2.15 kJ `mol^-1` when hydrolysis is catalysed by the enzyme sucrase. Explain.

The activation energy of a first order reaction at 300 K is 60 kJ mol^-1 . In the Presence of a Catalyst, the activation energy gets lowered to 50 kJ mol^-1 at 300 K. How many times the reaction rate changes in the Presence of a catalyst at the same temperature ?

At 27^@C in the presence of a catalyst, the activation energy of a reaction is lowered by 10 kJ mol^-1 . The ratio of log k (catalyst)/k (uncatalysed) is

The rate constant for a reaction is found to be 1.96xx10^-2 s^-1 at 313K. The activation energy of the reaction is 93.62 kJ mol^-1 . Calculate the frequency factor ,A.

The activation energy of a reaction is 56.2 kJ/mol. The ratio of the rate constant at 300 K and 305 K is (R = 8 J "mole"^(-1)K^(-1) ) about :

The activation energies of the forward and backward reactions in the case of a chemical reaction are 30.5 and 45.5 KJ/mol , respectively . The reaction is:

The activation energy for the reaction 2 HI(g) rarr H_2 + I_2 (g) is 209.5 kJ mol^(-1) at 58IK.Calculate the fraction of molecules of reactants having energy equal to or greater than activation energy?

A hydrogenation reaction is carried out at 500 K . If the same reaction is carried out in the presence of a catalyst at the same rate, the temperature required is 400 K . Calculate the activation energy of the reaction if the catalyst lowers the activation barrier by 20 kJ mol^(-1) . a) 100 kJ/mol b) 80 kJ/mol c) 60 kJ/mol d) none of these

The rate constant for the decomposition of hydrocarbons is 2.418 xx 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.