Question

J.D. Chapple-Sokol, C.J. Giunta, and R.G. Gordon (J. Electrochem. Soc. 136, 2993 (1989)) proposed the following radical chain mechanism for the initial stage of the gas-phase oxidation of silane by nitrous oxide: (1) (2) (3) (4) (5) (6) N2O N2 +O O SiH4 SiH3+ OH SiH3+H20 SiH30+ N2 SIH3OH+ SiH3 (H3Si)20 OH SIH4 SIH3+N20 SIH3O+ SiH4 SIH3+ SiH30 Label each step with its role in the chain. Use the steady-state approximation to show that this mechanism predicts the following rate law for SiH4 consumption (provided ki and k6 are in some sense small): dSiHal/d -k[N20

Answer 1

Auswea Gsen proposed the follouing Yadital chain mechanism initial Stage of the gas-phase onidation -for the silane by nitrous oxide as (UN20-Nto K sits+Ho' kz o'tsiHu (3) Ho tSiHn Sit3 t 420 k3 (SIH3N0 siHs6' +N2 Ku 5) SiH30 + SiHu SiH 30H +SiHa k () SiH3SiH20 Hs Si)2o k Theefove V/2 1ki ku ks) keN,0 J[ S: Hu] 2 AN dsHJ/t-CNsoJ[si4,J/