A + 2B C + 2D →>> The reaction is known to be first order in [A] and second order in [B]. When 0.30 moles A and 0.30 moles of B are placed in a 1.00 L container at 25 °C, 1.8 x 10-4 moles of C are formed per second with no change in volume. What is the rate constant at 25 °C? k = [?] Do not include units in your answer. Magnitude of k Enter

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
icon
Related questions
Question
100%
### Reaction Rate Calculation

**Reaction:**
\[ A + 2B \rightarrow C + 2D \]

**Given:**
- The reaction is first order in [A] and second order in [B].
- Initial concentrations: 0.30 moles of A and 0.30 moles of B.
- Volume of container: 1.00 L.
- Temperature: 25 °C.
- Rate of formation of C: \( 1.8 \times 10^{-4} \) moles per second.

**Task:**
Determine the rate constant, \( k \), at 25 °C.

### Calculation:

1. **Determine the Concentrations:**
   - \([A] = \frac{0.30 \text{ moles}}{1.00 \text{ L}} = 0.30 \text{ M}\)
   - \([B] = \frac{0.30 \text{ moles}}{1.00 \text{ L}} = 0.30 \text{ M}\)

2. **Rate Law:**
Since the reaction is first order in [A] and second order in [B], the rate law can be expressed as:
\[ \text{Rate} = k [A][B]^2 \]

3. **Plug in the Given Values:**
   - Rate: \( 1.8 \times 10^{-4} \) M/s
   - \([A] = 0.30 \text{ M}\)
   - \([B] = 0.30 \text{ M}\)

\[ 1.8 \times 10^{-4} = k (0.30)(0.30)^2 \]

4. **Solve for \( k \):**
\[ k = \frac{1.8 \times 10^{-4}}{(0.30)(0.09)} \]
\[ k = \frac{1.8 \times 10^{-4}}{0.027} \]
\[ k = 6.67 \times 10^{-3} \]

### Answer:
- Enter the magnitude of \( k \): **\[ 6.67 \times 10^{-3} \]**

Please ensure not to include units in the answer text box. The rate constant, \( k \), is calculated based on the provided reaction conditions at 25 °C.
Transcribed Image Text:### Reaction Rate Calculation **Reaction:** \[ A + 2B \rightarrow C + 2D \] **Given:** - The reaction is first order in [A] and second order in [B]. - Initial concentrations: 0.30 moles of A and 0.30 moles of B. - Volume of container: 1.00 L. - Temperature: 25 °C. - Rate of formation of C: \( 1.8 \times 10^{-4} \) moles per second. **Task:** Determine the rate constant, \( k \), at 25 °C. ### Calculation: 1. **Determine the Concentrations:** - \([A] = \frac{0.30 \text{ moles}}{1.00 \text{ L}} = 0.30 \text{ M}\) - \([B] = \frac{0.30 \text{ moles}}{1.00 \text{ L}} = 0.30 \text{ M}\) 2. **Rate Law:** Since the reaction is first order in [A] and second order in [B], the rate law can be expressed as: \[ \text{Rate} = k [A][B]^2 \] 3. **Plug in the Given Values:** - Rate: \( 1.8 \times 10^{-4} \) M/s - \([A] = 0.30 \text{ M}\) - \([B] = 0.30 \text{ M}\) \[ 1.8 \times 10^{-4} = k (0.30)(0.30)^2 \] 4. **Solve for \( k \):** \[ k = \frac{1.8 \times 10^{-4}}{(0.30)(0.09)} \] \[ k = \frac{1.8 \times 10^{-4}}{0.027} \] \[ k = 6.67 \times 10^{-3} \] ### Answer: - Enter the magnitude of \( k \): **\[ 6.67 \times 10^{-3} \]** Please ensure not to include units in the answer text box. The rate constant, \( k \), is calculated based on the provided reaction conditions at 25 °C.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps with 2 images

Blurred answer
Knowledge Booster
Rate Laws
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY