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(a) Propose a mechanism for the free-radical chlorination of ethane, $$\mathrm{CH}_{3}-\mathrm{CH}_{3}+\mathrm{Cl}_{2} \stackrel{h \nu}{\longrightarrow} \mathrm{CH}...

Question

(a) Propose a mechanism for the free-radical chlorination of ethane, $$\mathrm{CH}_{3}-\mathrm{CH}_{3}+\mathrm{Cl}_{2} \stackrel{h \nu}{\longrightarrow} \mathrm{CH}_{3}-\mathrm{CH}_{2} \mathrm{Cl}+\mathrm{HCl}$$ (b) Calculate $\Delta H^{\circ}$ for each step in this reaction. (c) Calculate the overall value of $\Delta H^{\circ}$ for this reaction.

(a) Propose a mechanism for the free-radical chlorination of ethane, $$\mathrm{CH}_{3}-\mathrm{CH}_{3}+\mathrm{Cl}_{2} \stackrel{h \nu}{\longrightarrow} \mathrm{CH}_{3}-\mathrm{CH}_{2} \mathrm{Cl}+\mathrm{HCl}$$ (b) Calculate $\Delta H^{\circ}$ for each step in this reaction. (c) Calculate the overall value of $\Delta H^{\circ}$ for this reaction.



Answers

Use the values in Table 6.2 to calculate $\Delta{H}^\circ$ for each reaction. Classify each reaction as endothermic or exothermic.
a. CH$_3$CH$_2$ - Br = H$_2$O $\longrightarrow$ CH$_3$CH$_2$ - OH + HBr
b. CH$_4$ + CI$_2$ $\longrightarrow$ CH$_3$CI + HCI


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