ORGANIC CHEMISTRY
ORGANIC CHEMISTRY
6th Edition
ISBN: 9781264073610
Author: SMITH
Publisher: MCG
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Chapter 6, Problem 43P
Interpretation Introduction

(a)

Interpretation: The energy diagram for the concerted reaction with ΔH°=80kJ/mol and Ea=16kJ/mol is to be drawn. The axes, the starting material, product, transition state, ΔH°, and Ea are to be labeled in the energy diagram.

Concept introduction: The reactions in which product are formed by the breaking and making of bonds in a single step are known as concerted reactions. The activation energy (Ea) aids in determining the rate of the chemical reactions. The small value of Ea exhibits that less energy is required to convert the reactants into products. It increases the rate of reaction. The change in enthalpy (ΔH°) indicates the relative position of starting material or product in the chemical reaction. The highest point in the energy diagram along the reaction coordinates is referred as transition energy. The energy difference between starting material or product is expressed by ΔH°.

Interpretation Introduction

(b)

Interpretation: The energy diagram for a two-step reaction, ABC, where the relative energy of these compounds is ACB, and the conversion of AB is rate-determining step is to be drawn.

Concept introduction: The reactions in which product are formed by the breaking and making of bonds in a single step are known as concerted reactions. The activation energy (Ea) aids in determining the rate of the chemical reactions. The small value of Ea exhibits that less energy is required to convert the reactants into products. It increases the rate of reaction. The change in enthalpy (ΔH°) indicates the relative position of starting material or product in the chemical reaction. The highest point in the energy diagram along the reaction coordinates is referred to as transition energy. The energy difference between starting material or product is expressed by ΔH°.

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Draw an energy diagram for each reaction. Label the axes, the starting material, product, transition state, ΔHo, and Ea. a. a concerted reaction with ΔHo = −80 kJ/mol and Ea = 16 kJ/mol a two-step reaction, A → B → C, in which the relative energy of the compounds is A < C < B, and the step A → B is rate-determining
Consider the following reaction: (a) The rate law for this reaction is first order in HBr(g) and first order in O₂(g). What is the rate law for this reaction? Rate = k [HBr(g)] [O₂(g)] O Rate = k [HBr(g)]² [O₂(g)] O Rate = k [HBr(g)] [O₂(g)]² O Rate = k [HBr(g)]² [0₂(g)]² O Rate = k [HBr(g)] [O₂(g)]³ O Rate = k [HBr(g)]4 [0₂(g)] (b) If the rate constant for this reaction at a certain temperature is 11500, what is the reaction rate when [HBr(g)] = 0.00379 M and [O₂(g)] = 0.00876 M? Rate = 4 HBr(g) + O₂(g) → 2 H₂O(g) + 2 Br₂(g) M/s. Rate = (c) What is the reaction rate when the concentration of HBr(g) is doubled, to 0.00758 M while the concentration of O₂(g) is 0.00876 M? M/S
Consider the following reaction: (a) The rate law for this reaction is first order in NO₂(g) and first order in O3(g). What is the rate law for this reaction? O Rate = k [NO₂(g)] [03(9)] Rate = k [NO₂(g)]² [03(9)] O Rate = k [NO₂(g)] [03(9)]² O Rate = k [NO₂(g)]² [03(g)]² Rate = k [NO₂(g)] [03(g)]³ Rate = k [NO₂(g)]4 [03(9)] (b) If the rate constant for this reaction at a certain temperature is 73200, what is the reaction rate when [NO₂(g)] = 0.973 M and [O3(9)] = 1.42 M? Rate = 2 NO₂(g) + 03(g) → N₂05(9) + O₂(g) M/s. Rate = (c) What is the reaction rate when the concentration of NO₂(g) is doubled, to 1.95 M while the concentration of O3(g) is 1.42 M? M/s

Chapter 6 Solutions

ORGANIC CHEMISTRY

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