Skip to main content
Ch.14 - Chemical Kinetics
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 14th EditionCh.14 - Chemical Kinetics문제 112f
14장, 문제 112f

In a hydrocarbon solution, the gold compound (CH3)3AuPH3 decomposes into ethane (C2H6) and a different gold compound, (CH3)AuPH3. The following mechanism has been proposed for the decomposition of (CH3)3AuPH3:
Step 1: (CH3)3AuPH3 k1⇌k-1 (CH3)3Au + PH3 (fast)
Step 2: (CH3)3Au k2→ C2H6 + (CH3)Au (slow)
Step 3: (CH3)Au + PH3 k3→ (CH3)AuPH3 (fast)
(f) What would be the effect on the reaction rate of adding PH3 to the solution of (CH3)3AuPH3?

검증된 단계별 안내
1
Identify the rate-determining step in the mechanism, which is the slowest step. In this case, it is Step 2: (CH_3)_3Au -> C_2H_6 + (CH_3)Au.
Recognize that the rate of the overall reaction is determined by the rate of the slowest step, Step 2.
Consider the role of PH_3 in the mechanism. PH_3 is involved in Step 1 and Step 3, both of which are fast steps.
Understand that since PH_3 is not involved in the rate-determining step (Step 2), adding more PH_3 will not affect the rate of the slow step.
Conclude that adding PH_3 to the solution will not change the overall reaction rate, as it does not influence the rate-determining step.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
1m
도움이 되었나요?

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Reaction Mechanism

A reaction mechanism describes the step-by-step sequence of elementary reactions by which overall chemical change occurs. Understanding the individual steps, including their rates and intermediates, is crucial for predicting how changes in conditions, such as concentration, will affect the overall reaction rate.
추천 영상:
가이드 코스
03:06
Reaction Mechanism Overview

Rate Law

The rate law expresses the relationship between the rate of a chemical reaction and the concentration of its reactants. It is determined by the slowest step in the reaction mechanism, which dictates how the reaction rate changes with varying concentrations of reactants, such as the effect of adding PH<sub>3</sub> in this case.
추천 영상:
가이드 코스
01:52
Rate Law Fundamentals

Catalysis and Inhibition

Catalysis involves the acceleration of a chemical reaction by a substance (catalyst) that is not consumed in the reaction. Conversely, the addition of certain substances can inhibit the reaction rate. Understanding how PH<sub>3</sub> interacts with the reactants can clarify whether it acts as a catalyst or an inhibitor in the decomposition of (CH<sub>3</sub>)<sub>3</sub>AuPH<sub>3</sub>.
추천 영상:
가이드 코스
01:59
Catalyzed vs. Uncatalyzed Reactions
관련 실천
교과서 질문

One of the many remarkable enzymes in the human body is carbonic anhydrase, which catalyzes the interconversion of carbon dioxide and water with bicarbonate ion and protons. If it were not for this enzyme, the body could not rid itself rapidly enough of the CO2 accumulated by cell metabolism. The enzyme catalyzes the dehydration (release to air) of up to 107 CO2 molecules per second. Which components of this description correspond to the terms enzyme, substrate, and turnover number?

919
views
교과서 질문

Platinum nanoparticles of diameter 2 nm are important catalysts in carbon monoxide oxidation to carbon dioxide. Platinum crystallizes in a face-centered cubic arrangement with an edge length of 3.924 Å. (c) Using your results from (a) and (b), calculate the percentage of Pt atoms that are on the surface of a 2.0-nm nanoparticle. (d) Repeat these calculations for a 5.0-nm platinum nanoparticle.

442
views
교과서 질문

In a hydrocarbon solution, the gold compound (CH3)3AuPH3 decomposes into ethane (C2H6) and a different gold compound, (CH3)AuPH3. The following mechanism has been proposed for the decomposition of (CH3)3AuPH3:

Step 1: (CH3)3AuPH3 k1⇌k-1 (CH3)3Au + PH3 (fast)

Step 2: (CH3)3Au k2→ C2H6 + (CH3)Au (slow)

Step 3: (CH3)Au + PH3 k3→ (CH3)AuPH3 (fast)

(c) What is the molecularity of each of the elementary steps?

358
views
교과서 질문

Platinum nanoparticles of diameter 2 nm are important catalysts in carbon monoxide oxidation to carbon dioxide. Platinum crystallizes in a face-centered cubic arrangement with an edge length of 3.924 Å. (b) Estimate how many platinum atoms are on the surface of a 2.0-nm Pt sphere, using the surface area of a sphere (4πr2) and assuming that the 'footprint' of one Pt atom can be estimated from its atomic diameter of 2.8 A .

462
views
교과서 질문

In a hydrocarbon solution, the gold compound (CH3)3AuPH3 decomposes into ethane (C2H6) and a different gold compound, (CH3)AuPH3. The following mechanism has been proposed for the decomposition of (CH3)3AuPH3:

Step 1: (CH3)3AuPH3 k1⇌k-1 (CH3)3Au + PH3 (fast)

Step 2: (CH3)3Au k2→ C2H6 + (CH3)Au (slow)

Step 3: (CH3)Au + PH3 k3→ (CH3)AuPH3 (fast)

(a) What is the overall reaction?

(b) What are the intermediates in the mechanism?

교과서 질문

In a hydrocarbon solution, the gold compound (CH3)3AuPH3 decomposes into ethane (C2H6) and a different gold compound, (CH3)AuPH3. The following mechanism has been proposed for the decomposition of (CH3)3AuPH3:

Step 1: (CH3)3AuPH3 k1⇌k-1 (CH3)3Au + PH3 (fast)

Step 2: (CH3)3Au k2→ C2H6 + (CH3)Au (slow)

Step 3: (CH3)Au + PH3 k3→ (CH3)AuPH3 (fast)

(e) What is the rate law predicted by this mechanism?

529
views