Question

Structure with an (8,4) coordination unit cell (0) Given the b. Calcium fluorite (CaF2) has a fluorite structure with an (8,4) coordina Given the following data, use Born-Haber cycle to calculate the lattice enthalpy of CaF2 AH KJ/mol +178 +1228 Sublimation of Ca(s) Decomposition of CaF2(s) Dissociation of F2(g) lonisation of Ca(s) lonisation of Ca (8) Electron gain of F(b) +79 +590 +1145 -328 Given the following data d* = 0.345x10-11m, K=1.20 MJÅ. mol-, e = 1.602x10-19 C, N = 6 022x1023mol and the ionic radil: Ca2+ = 0.998; F = 1.33) (11) Calculate the lattice enthalpy of CaF2 using the Kaputinskii equation. (15)

Answer 1

Born Haber Cycle. alt + 2F 79 Ca2+ + {(9) & Ca2+ +F₂ (1) - 2x328 590 +1145 +2F- 178 0 Ca (9) + F (1) bee 1227 Ca(s) + B) -21HL Cafy 1228 +178 +5900 11a5e79- 2 x 328 al - OHL = 2564 KJ / nnol. Kapustinski fon. SHLE 08748m) ZpZ-1 e No.4 415&(r++ ) - 2876 kJ/mol 345)