Explanation
As rate = k [RCl], on decreasing the concentration of RCl to half, the rate will also be halved.
As k' > k'',Ea' > Ea'' (Greater the rate constant, less is the activation energy).
22 = 4, 32 = 9.
From 1 and 3, keeping [B] const, [A] is doubled, rate remains unaffected. Hence rate is independent of [A]. From 1 and 4, keeping [A] constant, [B] is doubled, rate becomes 8 times. Hence rate ∝ [B]3 .
(2) involves only one molecule of the reactant.
As doubling the initial conc. doubles the rate of reaction, order =1.
A catalyst brings down the energy of activation.
Ea can be determined if we know k1 at T1 and k2 at T2.
As it is a reaction of 1st order, t1/2 does not depend upon initial conc.
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