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Chapter 16: Q16.9 P (page 728)

Give two reasons to measure initialrates in a kinetic study.

Short Answer

Expert verified

The answer is,

1) To calculate the overall rate of a reaction.

2) To calculate many other kinetic parameters.

Step by step solution

01

Rate of a reaction

The rate of a reaction is the speed at which the reactants undergo product formation at a constant temperature. The initial rate is the rate at the initial point of the reaction, where the reactant concentration is introduced.

02

Explanation

The two reasons to measure the initial rate in a kinetic study is as given below.

1) The overall rate of a reaction is calculated by measuring the rate of the forward reaction and that of the reverse reaction and taking the difference of both. This is done by finding the initial rate, the instantaneous rate at the initial point of addition of reactants to avoid complications of the calculations.

2) The initial rate of the reaction is used to calculate many other kinetic parameters.

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Most popular questions from this chapter

Express the rate of reaction in terms of the change in concentration of each of the reactants and products:

2D(g)+3E(g)+F(g)鈫�2G(g)+H(g)

When [D] is decreasing at 0.1 mol/L.s, how fast is [H] increasing?

Question: At 250C , what is the fraction of collisions with energy equal to or greater than an activation energy of 100. kJ/mol?

Suggest an experimental method for measuring the change in concentration with time for each of the following reactions:
(a)CH3CH2Br(l)+H2O(l)鈫�CH3CH2OH(l)+HBr(aq)(b)2NO(g)+Cl2(g)鈫�2NOCl(g)

If the temperature in Problem 16.60 is increased to 500C, by what factor does the fraction of collisions with energy equal to or greater than the activation energy change?

Carbon disulfide, a poisonous, flammable liquid, is an excellent solvent for phosphorus, sulfur, and some other nonmetals. A kinetic study of its gaseous decomposition reveals these data:

Experiment

Initial[CS2] mol/L

Initial rate (mol/Ls-1 )

1

0.100

2.7脳10-7

2

0.080

2.2脳10-7

3

0.055

1.5脳10-7

4

0.044

1.2脳10-7

(a) Write the rate law for the decomposition ofCS2 .

(b) Calculate the average value of the rate constant
See all solutions

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