Question

a Equilibrium constants can be measured for the dissociation of Lewis acid-base complexes such as the dimethyl ether complex of BF3, (CH3)20-%BF;. The value of K (here K) for the reaction is 0.17 at 125 °C. (CH3)20BF3 (8) =BF3 (8) + (CH3)2O(g) Is BF3 a Lewis acid or a Lewis base? Lewis acid Lewis base Correct b Is (CH3)20 a Lewis acid or a Lewis base? Lewis acid Lewis base Correct C If you place 1.1 g of the complex in a 61.5 ml flask at 125 °C, what is the total pressure in the flask at equilibrium? What are the partial pressures of the Lewis acid, the Lewis base, and the complex? P(BF) atm atm P((CH3)20) = P((CH3)20++BFx) = P(total) = atm atm <Previous Next

Answer 1

Yea Bf3 1 ew is i's a) acid a incomplete accept octet B has BF3 lewis electran paisr acd So a (CH310 i's lewi's base has lone pais of electrons wh'ce olonate Can 1ewis base

kept in a 6lSmlflak Initally complexaf molauity of complex mass Moleculos may VolumelL) Molauity 4gLmo) 61.5 x10 SL O.L M BE3lg +z0 taty Lo.e1sa-) Using Cdeal equation MRT PLBE3) RT PlcHao xRI ivea Kpa 0-12 LPLBF)eLenalo). Phetalo RE) Kpe O 17 2a2x O. 0 821 x 398 (0.1-) LOIS- -O.422 32.6822 O.027

-0.023 -O 32 6822 0.13 By teu's saluing quatioa Luadcatk we 0.026 0.031 she Agative not of valu acceptoble O.026 So PLBE) O.026 x O.0821 x 392 0.8Satm PlcHsD 0.026 x O 0821 x 398 O 8Satm. PICHal20Bfs (0.15a- 0.026) Xx Q.082 X 3 4.26atm. PBF3) PllCH20B) P(enalo Protal 0.a5 t 28 0.85 S.98 atm

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