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-BF3. The value of K (here Kp) 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? Wisited ewis acid Lewis base Correct c If you place 1.2 g of the complex in a 73.5 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? atm P(BF3) = atm P((CH3)2) = P[(CH3)20-BF3) = P(total) = atm atm Previous Next

Answer 1

((13) 0 Bf3 (9) F BF3 (g) + (chholg. Complex In the accepting - lewis acid lewis Base Complex, it is shown , Bfg in lone pair, so it is lewis a cid. Hotar a (a) lewis and BE3 (ط) S السقا - 50 O(ع) (C) Molar mass of complex = 11 + 19x3 + 16 +15x2 - 114g mole of complex - 1.2 - 0.0105 114 a Pv=nRT 3) P= 0.010 5 X 0.08 2x 398 = 4.66 athy 73.5 x 103

- PV=nRT P = 0.0105x 0.082х 398 73.5 x 103 = 4.66 atry (Culo BF₃ F BF +(6)0 17 P² + 0.17 P-0.792220 4.66 o o - P = -0.17 T / (0.14) + 4 x 0.792 7. 66- P P P T = -0.17 + √3.197 Kp = Byx cao 0.809 = 0.809 ats 0.17 = P² - 3.851 am -0.17 +1.788 Complex Complex 4.66-1 pe 0.17. (4.66 - = P² = 0.7922 - 0179 Total = 1.66 + 0.8 5.46 am 3