Question

Choose the compound in each set with the larger magnitude of lattice energy
I. rubidium iodide vs sodium chloride
II. magnesium chloride vs magnesium sulfide

III. copper(I) oxide vs copper(II) oxide

sodium chloride, magnesium sulfide, copper(I) oxide

rubidium iodide, magnesium sulfide, copper(II) oxide

sodium chloride, magnesium chloride, copper(I) oxide

sodium chloride, magnesium sulfide, copper(II) oxide

rubidium iodide, magnesium sulfide, copper(I) oxide

Answer 1

IBC IVU. OR I Lattice Energy (LE): It is defined as the amount of energy required to break the ionic bond of Imole solid into its gaseans ions. It is defined as the amount of energy released for the formation of Imole of lonic solid from its gaseous ions. Coloumbic force of interaction = kq, 22 42 TLE=K9,92 q, q, → Multiplication of charges 2 1 r inter-ionic distance ILEX multiplication of changes & LEX I t g es Cinder-Tonic distance) # For Lattice energy order calculation a multiplication of change facter dominates #ty multiplication of charge factor is same then order is decided by versione distance. Latthee eneren is Lattice energy more if multiplication of Charges is more. is less if inter-lonic distance is more All Rubidium Rh I I Rb To iodide ve sodium Chloride wen Nach Rotast I g Nacky Natgot clogg both have same multiplication of charges but Rb and I have larger size than Na and of respectively. So Nacho Lattice energy is more than RbI LE=K2, 22 Sianature:

tu Page No. Magnesium chloride (MgCla 3 vs Magnesium Sulfide (Mys) My Cz (8) Mght (g) + crego Mgs Maglig tsags. 9, 2 (Mg Ch) => +2*-=-2 . 9, a. (mgs) + + 2x-22-4 Mas have more magnitude of multiplication of charges Compared to Macl. hence lattice energy magh tude of Mas is more than Macha 111) Copper (1) oxide (yons Copper (1) oxide (cuo) ugo - Cut g + O²(g) Cuo (8) Curt at 0²g. q, q (u,0) = +1x -2=- 2 9 a, (cuo) = +2% -2 = -4. sin Lattice energy of the cuo is more than 40 because Cuo ( Copper (11) oxide) has more magnitude of multiplication of charges. {LE = kq, 924 # Sodium Chloride, Nad} , Magnesium sulfide dy & Magnesium sulfide (mgs), copper (1) oxide (ayoll cut +02- 9,4 = +18-1=-| aq = +2% -2=-4 a, a, = +14-2=-2 Since mas Magnesium sulfide} has more magnitude of multiplication of changes hence Magnesium sulfide has larger magnitude of daltice eneagy. # Rubidium Iodide (RbI), Magnesium sulfide , Copper (11) oxide RbI + Rb+ + I- MS + Mg 2+ + 2 CuO + y 2+ + 027 19,9 = 1 9, q = -4 a, a, = - 4 Mas has langer tonie inter-lonic radius thay cuoi hence has has larger lattice energy # As atoma page of Mih is larger thay cult and also statomte high is more thay 02 Cuo more lattice energy. bog - Tonic Rate

2, 4, = -1 0 # sodium chloride (Nad), Magnesium Chloride (my ) Copper (Doxide (Curly Nad & Nag + ctg My G (6) Mart Ugo Cuo lugntot 9,9,= - 2 9 ,9 = -2 Since Magnesium Chloride have same magnitude of multiplication of Charges compared to Copper (1) oxide. So we need to check ineryone radius .. ore the interionic radius less the lattice energy Mght alonnades more than cuat also u Ponie radery is more than o2- Hence Mach has terge iner-sonic distance compared to Cago. Thus Cuso has langer lattice energy # Sodium Chlorüde (Nad) Magnesium sulfide (mgs) Copper (11) oxide Nad (6) Nattelig mas mag shigo Cuo t antot og 22= -1 a, a, = - 4 29, = -4 Mg 2+ ionis radius is more than cu 24 and also stronie radius is more than 02 # More the con interionic distance less is the lattice energy. Mas has been more serionie distance compared to Cuo Hence tofft) Copper (11) oxide has larger magnitude of lattice energy # Rubidium iodide (RbI), Magnesion sulfide (ngs) Copper (1) oxide RII Rb + I Mas Might +32- 430 Eu + +0? q, a, = 21 9 , 22 = -4 and = +1X-2=-2 sance Mgs has larger magnitude of multiplication of Charges hence Mgs has larger lattice energy #mone the magnitude of multiplication of charges more 9 the lattice energy. (20)