Question

Suppose the synthesis of ethylene dichloride proceeds by the following mechanism: step rate constant elementary reaction CH,CH, (g)+ci, (g) → CH,CH,ci* (g)+ciº (9) CH,CH,CI* (g)+C1 (g) → CH,CH,C1, (g) Suppose also kq «k2. That is, the first step is much slower than the second. Write the balanced chemical equation for the overall chemical reaction. Write the experimentally- observable rate law for the overall chemical reaction. Note: your answer should not contain the concentrations of any intermediates. rate = % 0

Answer 1

Given, (i) CH₂ CH₂ (9) + Cl₂ (8) Ki CH₂ CH₂ eet (8) tei C) che etteet (8) + eī () K2_, CH2 CH2UZ (O) Overcell rxn: 0 +Gi). CH₂ CHg (9) + C12 (6) CH₂ CH₂ Cle (8) 7 As given kikkkq We can assume steady state approximation where, » > d[CH₂CH₂Clt] =0 dt ki Ceheehe] [42] - K2 [cHeChyer [ei]=0 ke [etechzcit][41] - ki[CH2CH2] [42] Thur, Rate of rand [CH₂ CH₂ ele] _kz [CH₂ CH₂ C1" ] La dt = KI [CH₂CH₂ II, This amouer is non _4[CH2 CH2] [cz]