Solution - Factors Influencing Rate of a Reaction



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A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is (i) doubled (ii) reduced to half?


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The following results have been obtained during the kinetic studies of the reaction:

2A + B → C + D

Experiment A/ mol L−1 B/ mol L−1 Initial rate of formation of D/mol L−1 min−1
I 0.1 0.1 6.0 × 10−3
II 0.3 0.2 7.2 × 10−2
III 0.3 0.4 2.40 × 10−2
IV 0.4 0.1  

Determine the rate law and the rate constant for the reaction.

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Distinguish between SN1 and SN2 mechanisms.

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(a) A reaction is second order in A and first order in B.

(i) Write the differential rate equation.

(ii) How is the rate affected on increasing the concentration of A three times?

(iii) How is the rate affected when the concentrations of both A and B are doubled?


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For a reaction, A + B → Product; the rate law is given by, `r = k[A]^(1/2)[B]^2` . What is the order of the reaction?

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For the first order thermal decomposition reaction, the following data were obtained:

Time / sec               Totalpressure / atm

0                              0.30

300                          0.50

Calculate the rate constant

(Given: log 2 = 0.301, log3 = 0.4771, log 4 = 0.6021)

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