Chemistry Class 12 NCERT Solutions: Chapter 4 Chemical-Kinetic Part 11

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Q: 22. The rate constant for the decomposition of at various temperatures is given below:

Q_22_Table of the Rate Constant for the Decomposition
Q_22_Table of the Rate Constant for the Decomposition

0

20

40

60

80

Draw a graph between ln and and calculate the values of A and .

Predict the rate constant at .

Answer:

From the given data, we obtain

Q_22_1_Table of Rrate Constant for the Decomposition of N2 O5 at Various Temperatures
Q_22_1_Table of Rrate Constant for the Decomposition of N2 O5 at Various Temperatures

0

20

40

60

80

273

293

313

333

353

Table of Rate Constant for the Decomposition of N2O5 at Various Temperatures

Rate Constant for the Decomposition of N2O5

Table of Rate Constant for the Decomposition of N2O5 at Various Temperatures

Slope of the line,

According to Arrhenius equation,

Slope

Again,

When

Then,

Therefore,

When

Then,

Therefore,

Again, when

Therefore,

Q: 23. The rate constant for the decomposition of hydrocarbons is . If the energy of activation is , what will be the value of pre-exponential factor.

Answer:

According to the Arrhenius equation,

Therefore,