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Use bond energies to determine for the reaction between

Chapter 9, Problem 14SAQ

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QUESTION:

Use bond energies to determine ∆Hrxn for the reaction between ethanol and hydrogen chloride.

a) -1549 kJ

b) 1549 kJ

c) -12 kJ

d) 12 kJ

Questions & Answers

QUESTION:

Use bond energies to determine ∆Hrxn for the reaction between ethanol and hydrogen chloride.

a) -1549 kJ

b) 1549 kJ

c) -12 kJ

d) 12 kJ

ANSWER:

Solution 14SAQ We want to demonstrate the righ option is c) H =rxn2 KJ Step 1 of 2 The reaction consists in breaking C-O and H-Cl bonds and in forming C-Cl and H-O bonds. Since H = H’s bonds broken - H’s bonds formed rxn We have to know the H for C-O and H-Cl bonds breaking and H for C-Cl and H-O bonds formation. We know that when bonds break, the process is endothermic (H>0) and when bonds form, the process is exothermic (H<0).

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