Question

Consider an ionic compound, MX,, composed of generic metal M and generic, gaseous halogen X. • The enthalpy of formation of MX, is AH; = -841 kJ/mol. • The enthalpy of sublimation of Mis AH sub = 111 kJ/mol. • The first and second ionization energies of M are IE = 615 kJ/mol and IE2 = 1353 kJ/mol. The electron affinity of X is AHEA = -319 kJ/mol. (Refer to the hint). • The bond energy of X, is BE = 203 kJ/mol. Determine the lattice energy of MXZ. A Hattice = 1870 kJ/mol

Answer 1

o Cublimation of mi mi - mig, heas = 1186m 1st ionisation of M. Migo amigotes 16 = 6156 Fugl and ionisation of m .mtas m2, té 1€ = 1353 kJ mo Dissociation of . ' X2 BE = 203 kJ mot Formation of 2x5; 2Xg;+ 2e + 2x rg, 6 Hex = - 31963 Formation of MX2 ; Mtigst 2 x 1g, - MX2 (6, (Lattice energy) formation (net reaction). mis + x2199 — Nitzes , om Det = heup + E + E + BE + DHEA + DH. DH= Df to - ahsus - It, -IE - BE CD HE A =(-841 -111 -615-1353 -203: + 3110k Imot? = -28 on kJ moin ③. Bounds dissociated = 3N-H bond, 20=0 bond Bonds formed = 2N-o bond 30-4 bond, IN=o bond. - Nitry +2029 - HNO3 lg at 2019,

2 H . Of to = 3 Ahorn + 2 Hoco - 2AHNo - 3D Moth 1 -1.DHN=o = 3(390) + 2(502) – 2(201) -3 (464) - -(607)] kJ more = (1170 + 1004 -402 - 1392 -607) K Smar = -227 kJ mol ® Ca Hy Lg + HBr 191 - Cz Hs Br 19, Bonds dissociated = 1 cc bond , I H- Br bond Bonds formed = 16H bond, 1 GBn bond. 16-C bond. of tho = OH CH +BH H. Br -DHGH-DHC-e-D HerBr (615 + 368 -414-347 -296 kJ mons 1 -54 kJ mol