Question

K²=1.08 x 10 5kJpm moi- d = 34.5pm K = 1.21 x 105 KIpm noel . (r +r)= ronic radií Use Kapustinski's equation (in paragraph 4.14) to calculate ionic lattice energy for these two oxides. Melting point of BeO is -2.500°C; melting point for MgO is 2,850°C. Do your calculated lattice energy values support these numbers? (4 points) DH = Nion/ Kapustinskis equation is simplified to DH = Nion/Z. Zel & Y + r

Answer 1

Kapustinski's equation D = Vim) 2+ 2) (uf- d = 345x18"m К. І. хочут mor" v= number of ims in the empisical id=rtir- formula sonic distance (rader for Beo putting values in the equation V= t = 21 2+ &z =1 185*10-12 x 185x151 x) st 45pm g. 14opm X |--| X 163 km ) on = 8x (0.81 x 1-218154 105X1012 pur D = 2 (2+2) (1-3.uskoro = 4.238x10 6 Gimori 2 4-238 x 10' simul 4.2 38x103 kg/mol 4238kJ/mol T on :

for mgo putting values in the equation V2 2 6 ton. 2 (2+2) 1-3.45710th of at&z=1 (72+140) 410th of {12x15th rta 72pm ja luopm X 1-21 Xlow this 8 (6.837) × 1.21810-4 1212x512 = 0.03821 alah 10-8 OH = Toning 3.821 x 1076 J/most 3921 19 J/mol