Question

pleas help me with 11 & 12

11. Zirconium reacts with iodine to form zirconium (III) iodide, releasing heat: 2 Zr(s) + 3 12 (9) 2 Zrlə (s) AH m = - 842.4 kJ/mol Determine the mass of zirconium that reacts if 1661 kJ of heat is given off by the reaction. 12. Use the Born-Haber cycle to calculate the lattice energy of LiClo) given the following data: AH(atomization Li = 155.2 kJ/mol ionization energy Li = 520 kJ/mol bond dissociation energy (CI-CI) = 242.8 kJ/mol X (1/2) electron affinity (CI) = -348 kJ/mol AH: (LICI) = -408.8 kJ/mol su dobrodo HEOS- HOCHOCHO

Answer 1

2 Z 3I, Came) Accerding t ths eacion, 2 2n 3 Atn-824 m (3me) 2 mol o ZY reacti with 3 mot o I2 When 2 moly ob Zn3 fmed t are 824.4 KJImot theat deleaged Griven Heat gven off by th n = 1661 K So, fist fid the mo: mal Z and I, the aeachon to ave in oode alouw eacted o thin muc theat (1661 KJ) males of Z 811.4 KJ 1661 KJ X 2 moler ZY o.99 mole moles ob I 824.4 KJ x 3 meles I2 .48 moles Mass moler We know that AtmicRmolar mass Moler x atonue ar molar ma OR Mass=

males x Atomic Nas o Zircnim (Zr) Nass Zr = 91 O.99 X Atoric mas Zrz 91 90,099 maisz T, melgr man Mass o I Atomdc man of Z l97 u molar mas I,- 2X 127 = 315.9 Mas エと -408-3 Kalmel AHf Lit) ) Lica(s) 12 D(Dissocation enant atomisaon 2 242.8 2 =155.1 kamt Ligh Ladto eneg C(8) Elechen gain ertalby (08 Eechen aftiwy) Ionigaton enory CIE) 520k7 md AgH=-318amy Lica + Bom Haber Cy Cle

Hesls Law, the enthalby of tomation, Acnding to AHf AegHU D AHatemisas on AptH .- 0 D U-ApH-AHat OR IE valuer n abve Substihute all the -468.8-15s.2-2428-520 -(-348) -4088- 155-ド- 121,4-52o+ 348 ke1 1 357.4 KMot ac enhat Lice 851. k