Chapter 16: Q16.63P (page 731)

For the reaction $A_{2} + B_{2} \to 2 A B$ , $E_{a (f w d)} = 125 k J / m o l$ and $E_{a (r e v)} = 85 k J / m o l$ . Assuming the reaction occurs in one step,
(a) Draw a reaction energy diagram;
(b) Calculate role="math" localid="1663350265727" $∆ {H^{0}}_{r \times n}$ ; and
(c) Sketch a possible transition state.

Short Answer

Expert verified

(a) A reaction energy diagram is

Reaction Energy Diagram

(b) the $∆ {H^{0}}_{r \times n}$ is equal to 40 kJ/mol.

(c) A transition represents the weakening of old bonds (A-A) and (B-B) along with the formation of new bonds (A-B). Draw the transition state for the reaction:

Step by step solution

Step 1: Draw a reaction energy diagram

Since the reaction is endothermic, the products’ energy will be higher than that of the reactants. Draw the reaction's energy diagram:

Step 2: Calculate ∆H0r×n

Determine the $∆ {H^{0}}_{r \times n}$ as follows:

$∆ {H^{0}}_{r \times n} = E_{a (f w d)} - E_{a (r e v)} = 125 k J / m o l - 85 k J / m o l = 40 k J / m o l$

Thus, it $∆ {H^{0}}_{r \times n}$ is equal to 40 kJ/mol.

Step 3: Sketch a possible transition state

A transition represents the weakening of old bonds (A-A) and (B-B) along with the formation of a new bond (A-B). Draw the transition state for the reaction:

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Experiment	Initial $[C S_{2}]$ mol/L	Initial rate ( $m o l / L s^{- 1}$ )
1	0.100	$2.7 \times 10^{- 7}$
2	0.080	2.2 $\times 10^{- 7}$
3	0.055	1.5 $\times 10^{- 7}$
4	0.044	1.2 $\times 10^{- 7}$

Short Answer

Step by step solution

Step 1: Draw a reaction energy diagram

Step 2: Calculate ∆H0r×n

Step 3: Sketch a possible transition state

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For the reaction A2+B2→2AB, Eafwd=125kJ/moland Earev=85kJ/mol. Assuming the reaction occurs in one step,(a) Draw a reaction energy diagram;(b) Calculate role="math" localid="1663350265727" ∆H0r×n; and(c) Sketch a possible transition state.

Short Answer

Step by step solution

Step 1: Draw a reaction energy diagram

Step 2: Calculate ∆H0r×n

Step 3: Sketch a possible transition state

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Chemical Analysis

Inorganic Chemistry

The Earths Atmosphere

Making Measurements

Chemical Reactions

Nuclear Chemistry

Study anywhere. Anytime. Across all devices.