Question

TABLE 8.3 Thermochemical Data and Lattice Energies for Alkali-Metal Halides AH, 298 AHSub" IE AH EA UB-H UB-L diff." Ulan LIF - 968 -886 - 784 7.5 4.5 5.1 5.1 - 960 - 873 - 774 NaF KF REF CsF - 752 -- 741 -709 4.3 LiCI 1 59.4 107.3 89.2 80.9 76.1 159.4 107.3 89.2 80.9 76.1 159.4 107.3 5.9 4.6 NaCl KCI RbCI CsCI 5.7 5.8 -616. 0 -573.6 - 567.3 -557.7 --553.5 - 408.6 - 411.1 - 436.8 - 435.3 - 443.0 - 351.2 - 361.1 - 393.8 - 394.6 - 395.0 - 270.4 - 287.6 -- 327.9 - 333.8 - 346.6 4.6 520.3 495.9 418. 9 403.1 375.8 520.3 495.9 418.9 403.1 375.8 520.3 495.9 418. 9 403.1 375.8 520.3 495.9 418.9 403.1 375.8 79.0 79.0 7 9.0 79.0 79.0 121.7 121.7 121.7 121.7 121.7 111.9 111.9 111.9 111.9 111.9 106.8 106.8 106.8 106.8 106.8 - 328.0 -328.0 - 328.0 - 328.0 - 328.0 - 349.0 - 349.0 - 349.0 - 349.0 - 349.0 - 324.7 - 324.7 - 324.7 - 324.7 - 324.7 - 295.2 - 295.2 - 295.2 - 295.2 - 295.2 -1046.7 -927.8 -826.4 - 792.7 - 756.4 - 861.0 - 787.0 -- 717.6 -692.0 - 667.6 -818.1 - 751.5 -689.1 - 665.8 - 634.1 - 761.7 - 702.6 .647.6 - 629.4 .610.1 - 724 -810 - 751 -677 -652 -637 - 774 - 719 - 650 -628 -613 - 724 - 675 -614 - 593 - 580 -810 - 746 - 672 - 647 -622 - 772 - 713 - 645 -622 4.3 89.2 LiBr NaBr KBr RbBr CsBr Lil Nal KI RbI Csi 5.7 80.9 76.1 159.4 107.3 89.2 80.9 76.1 -718 -667 5.0 3.9 5.2 5.8 4.9 - 607 -586 - 566

Calculate the lattice energy of lithium iodide, using both the Born–Landé and the Kapustinskii equations. Compare these values with those found in Table 8.3.

Answer 1

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a for Boon - hande equation, Voz - 1.39X10SXA X]z +117=1861-17 ___Mo . As Madeleeng Constant. A- Born exponent ro inter ednic distance. Vos Lattice Energy a ♡ Madelina Constant depends on geometry. I has a rock salt estructure having a madeleing constant = 1.75 O Bonn exponent depends on neember of elections dit has' esame no. of e as te. I- has esame no. of es as Xe.. a Hez 5 - Xe = 1 . Final a for 1 c I = 12+5 = 8.5 o ro= rt t r. Tot claclius of cation q0+206 = 296.1 - ... rors - > radius of anion 12+1= 1 ; 12-1=1 in Vo = 1:39 X105 J/mol) lom) x 175x 1 x 11-11 ' 296 pm 8.5) - - 723 kJ . (Answer) 2 Esstanned with Camscanner

Kupustensa ko Equestion, 84.5 sho No - 120 200 w Z+Z-/- - Mo. where vt no. of conser for Li I v = 2 a's Vo = -120200 x 2x1 / 1- 3415| 296 296 =.=715 kJ. CAnswer CScanned with CamScanner