A Possible Reaction of Ethane with Chlorine Is Shown Below

question 30

Multiple Choice

A possible reaction of ethane with chlorine is shown below. $$\mathrm { CH } _ { 3 } \mathrm { CH } _ { 3 } + \mathrm { Cl } _ { 2 } \longrightarrow \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { Cl } + \mathrm { HCl }$$ This reaction could conceivably occur by the following chain mechanisms [1], [2], and [3]. Determine ?H for step [2]. [1] $\quad \mathrm { Cl } _ { 2 } \longrightarrow 2 \mathrm { Cl } \cdot$
[2] $\mathrm { Cl } ^ { \cdot } + \mathrm { CH } _ { 3 } \mathrm { CH } _ { 3 } \stackrel { \text { slow } } { \longrightarrow } \mathrm { HCl } + \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } ^ \cdot$
$[ 3 ] \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } ^ \cdot + \mathrm { Cl } _ { 2 } \stackrel { \text { fast } } { \longrightarrow } \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { Cl } + \mathrm { Cl } ^\cdot$ Bond dissociation energies (kcal/mol) : $$\begin{array} { | l l | } \hline \text { Bond A-B } & \Delta \mathrm { H } \\\hline \mathrm { Cl } - \mathrm { Cl } & 58 \\\mathrm { CH } _ { 3 } - \mathrm { H } & 104 \\\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } - \mathrm { H } & 98 \\\mathrm { CH } _ { 3 } \mathrm { CH } _ { 3 } & 88 \\\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } - \mathrm { Cl } & 81 \\\mathrm { H } - \mathrm { Cl } & 103 \\\hline\end{array}$$

• A) -5 kcal/mol
• B) +58 kcal/mol
• C) -28 kcal/mol
• D) None of the choices are correct.

Grasp the concept and rationale behind outsourcing decisions in projects.

Acquire knowledge on assessing potential bidders' financial status.

Comprehend different contract types and their application based on project scope and cost uncertainty.

Explain the structure and components of a cost reimbursable contract.

---

Definitions:

Salads and Steaks

This term generally refers to food items, specifically fresh vegetable dishes and cuts of beef cooked in various ways, often highlighting a contrast in dietary choices.

Task Performance

The measurement of how effectively and efficiently an individual or group completes a job-related task.

Expertise

The specialized knowledge or skill in a particular field or area, usually gained through education, training, and experience.

Relationships

Connections or bonds between people based on various factors such as love, kinship, common interests, or professional interactions.