Question

(b) Draw a Born-Haber cycle for the Lithium telluride, clearly label the thermochemical data that would be required for each stage. (5) thium telluride, clearly label the diagram showing the (5 points)

Answer 1

TRIP * Bolm Haber cycle - ins used primarly mainly for calculating lattich enthalpy (With Lattice), because lattice enthalpy cannot be measered directly because in most of reaction jonic state are transition state and we cannot isolate transition state in labs. So we do it theoreticaly - Lithium telluride (Ligte): lot heat of 2 Li (s) + Te(s) Hy Liste formation ott 2xx Haton for anal o Hatamination of Te o Hat Telg o Healtice of LP 2.0HA 2 Li(g) (for a nucle) 20 Hast ionsation 2001. V Loops Felg hit the 20H or lo Helctron affinity on the alit +Te 2- 1 (6tht) Hatanization - energy for converting solid to gas electrom from (Hot ionization renergy for us so ground state of atom collas Helection affinity & Energ for adding election.

In case of Li we have multiplied by a to the Halomization and otlagi. ( and make because 2 moles is formed a to calculate Laltice, enthalpy: - ( Apply energy conserva an Born taber reyalle: Niet energy change is on reaus enery of in means seun of energy of clockwise and anticlockwise is o clockwise arrones orierges es ums - o Hf - Anticlockwise energy as (tm) = 2 Hati Hatta Apply energy conservation 20 Hatci + Hatent, + 2 Atrict 20HEA to Healtice - ulf to at Lattice - Off (2 . Hatli +2 AH 14 I Cof; + 2 å hen) ta Hataw te) all oth at STP. atlatticen er dattic enthalpy. Format renthalpy change, during the formation of one mole of an ionic compound AC- from its gaseous aious at STP. we use born babier cycle to calculate fattice enthalpy because we cauna caloulal ott lattice directly, since the ious are formed as Hansition state and transition strate cannot be isolated to calculate energy in sals.