Solution - Integrated Rate Equations - First Order Reactions



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The rate constant for a first order reaction is 60 s−1. How much time will it take to reduce the initial concentration of the reactant to its 1/16th value?


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The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 K. If the value of is 4 × 1010 s−1. Calculate at 318 K and Ea.

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The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :SO2Cl2 (g) → SO2 (g) + Cl2 (g)

Experiment Time/s–1 Total pressure/atm
1 0 0.5
2 100 0.6

Calculate the rate of the reaction when total pressure is 0.65 atm.

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The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:

Experiment A/ mol L−1 B/ mol L−1 Initial rate/mol L−1 min−1
I 0.1 0.1 2.0 × 10−2
II -- 0.2 4.0 × 10−2
III 0.4 0.4 --
IV -- 0.2 2.0 × 10−2
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A reaction is first order in A and second order in B. How is the rate affected on increasing the concentration of B three times?


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In a pseudo first order hydrolysis of ester in water, the following results were obtained:

t/s 0 30 60 90
[Ester]mol L−1 0.55 0.31 0.17 0.085

(i) Calculate the average rate of reaction between the time interval 30 to 60 seconds.

(ii) Calculate the pseudo first order rate constant for the hydrolysis of ester.

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