#reaction completion

Rate of Reaction - Average and Instantaneous Rate and Rate Law

A first-order reaction has a rate constant of 0.0139 min⁻¹. What is the time for 60% completion?

t = (2.303/0.0139) log(1/0.4) ≈ 66 min.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Rate of Reaction - Average and Instantaneous Rate and Rate Law

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Pseudo First Order and Complex Reactions

A first-order reaction is 25% complete in 15 minutes. What is the rate constant?

k = (2.303/15) log(1/0.75) ≈ 0.0192 min⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Pseudo First Order and Complex Reactions

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Pseudo First Order and Complex Reactions

A first-order reaction is 40% complete in 15 minutes. What is the rate constant?

k = (2.303/15) log(1/0.6) ≈ 0.0341 min⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Pseudo First Order and Complex Reactions

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Pseudo First Order and Complex Reactions

A first-order reaction is 25% complete in 10 minutes. What is the rate constant?

k = (2.303/10) log(1/0.75) ≈ 0.0288 min⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Pseudo First Order and Complex Reactions

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Pseudo First Order and Complex Reactions

A first-order reaction has a rate constant of 0.0173 min⁻¹. What is the time for 80% completion?

t = (2.303/0.0173) log 5 ≈ 93 min.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Pseudo First Order and Complex Reactions

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Pseudo First Order and Complex Reactions

For a first-order reaction, how many half-lives are required for 75% completion?

25% remains = (1/2)² → 2 half-lives.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Pseudo First Order and Complex Reactions

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Pseudo First Order and Complex Reactions

A first-order reaction is 30% complete in 15 minutes. What is the rate constant?

k = (2.303/15) log(1/0.7) ≈ 0.0238 min⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Pseudo First Order and Complex Reactions

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Pseudo First Order and Complex Reactions

A first-order reaction is 10% complete in 5 minutes. What is the rate constant?

k = (2.303/5) log(1/0.9) ≈ 0.0211 min⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Pseudo First Order and Complex Reactions

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Order and Molecularity and Units of Rate Constant

A first-order reaction is 20% complete in 12 minutes. What is the rate constant?

k = (2.303/12) log(1/0.8) ≈ 0.0186 min⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Order and Molecularity and Units of Rate Constant

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Order and Molecularity and Units of Rate Constant

A second-order reaction has a rate constant of 0.02 L mol⁻¹ s⁻¹ and an initial concentration of 0.25 mol L⁻¹. What is th

t = (1/0.05 − 1/0.25)/0.02 = 800 s.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Order and Molecularity and Units of Rate Constant

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Order and Molecularity and Units of Rate Constant

A first-order reaction is 40% complete in 20 minutes. What is the rate constant?

k = (2.303/20) log(1/0.6) ≈ 0.0256 min⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Order and Molecularity and Units of Rate Constant

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Integrated Rate Equations - Zero Order Reactions

A second-order reaction has a rate constant of 0.05 L mol⁻¹ s⁻¹ and an initial concentration of 0.4 mol L⁻¹. What is the

t½ = 1/(k[A]₀) = 1/(0.05×0.4) = 50 s.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - Zero Order Reactions

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