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#reaction rates

3 public questions tagged with this topic.

CHEMISTRY

For the reaction 3A -> 2B + C, the concentration of A decreases from 0.27 M to 0.24 M in 15 seconds. What is the average

Given: For the reaction 3A -> 2B + C, the concentration of A decreases from 0.27 M to 0.24 M in 15 seconds. What is the average rate of formation of B in mol L^{-1 s^{-1 ? Formula: Rate = -1/3 fracΔ[A]Δ t = 1/2 fracΔ[B]Δ t = fracΔ[C]Δ t. Substitution & Calculation: Δ[A] = 0.24 - 0.27 = -0.03 mol L^{-1, Δ t = 15 s . -fracΔ[A]Δ t = 2.0 × 10⁻³, so fracΔ[B]Δ t = 2/3 × 2.0 × 10⁻³= 1.33 × 10⁻³. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

A reaction has k = 6.0 × 10⁻⁶ s^{-1 at 300 K and E_a = 50 kJ mol^{-1 . What is the pre-exponential factor A in s^{-

Given: A reaction has k = 6.0 × 10⁻⁶ s^{-1 at 300 K and E_a = 50 kJ mol^{-1 . What is the pre-exponential factor A in s^{-1 ? (R = 8.314 J/mol · K) These values define the system as per NCERT data. Formula: k = A e^{-E_a/RT. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: 6.0 × 10⁻⁶= A e^{-50000/(8.314 × 300), A = 6.0 × 10⁻⁶/ e^{-20.06 = 3.2 × __10POW₃__. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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Kinetics and Thermodynamic

Which of the following best describes reaction kinetics?

Study of reaction rates and mechanisms is the scientifically accurate answer to this question. Within the study of Kinetics and Thermodynamic, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Study of reaction rates and mechanisms directly address what is being asked. Among the other options, Study of energy changes during a reaction, Study of equilibrium constants, and Study of entropy changes do not correctly answer this question because they either refer to different co

Ref: Campbell Biology, Urry et al., 12th Ed.

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