1. Using the table of bond dissociation enthalpies, calculate H ° for the reacti

Question

1. Using the table of bond dissociation enthalpies, calculate H° for the reaction A.

(Use the entries for propene and propenyl halides for the calculation of cyclohexene and cyclohexenyl halides, respectively. Pay attention to the algebraic sign of your answer!)

#2

Using the table of bond dissociation enthalpies, calculate /T for the reaction A. Use the entries for propene and propenyl halides for the calculation of cyclohexene and eyclohexenyl halides, respectively. Pay attention to the algebraic sign of your answer) Table of bond dissociation enthalpies C-H bond C-X bond CH3-I C2Hs-I (CHs) CHI 238 (CH)C-I 214 CH2 CHCH292 EDE (kmol) X and HX bonds BDE (k.mol) 242 238 BDE

Explanation / Answer

DH0 = (1*dHod,C-H) + (1*dH0d,I-I)+(1*DH0f,C-I)+(1*DH0f,H-I)

    = 1*372+1*151+1*-192+1*-297

    = 34 kj

1st , DH0rxn = (1*dHod,C-H)+ (1*DH0f,H-I)

              = (1*372)+(1*-297)

              = 75 kj

2nd, DH0rxn = (1*dH0d,I-I)+(1*DH0f,C-I)

            = (1*151+1*-192)

            = -41 kj

rate -determining step = 1st

BDE A = 556 Kj/mol

BDE B = 464 Kj/mol

BDE C = 372 Kj/mol

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