Question

i am having a hard time trying to calculat the madelungs constant for CaS.

1. Use the following data to do the following calculations: Ca ionic S ionic Cas Born Ca radiusradius 1.14 A 1.70A 9 S2 dissociation S electron affinity Ca sublimation ionization +178k/mol exponent İ-200 k/mol (1") 429 kJ/mol (of S2)+532 k/mol (2 +590k/mola-) 1150 kJ/mol (2 a. Calculate the lattice formation energy for Cas in kKJ/mol. Be sure to watch your units don't forget about the t2 charges! Calculate the standard enthalpy of formation of Cas. Loo b. k up the standard enthalpy of formation of Cas and compare it to your calculated value. Does the ionic bonding model work well for Cas c.

Answer 1

Calcium sulfide (CaS) crystallizes in cubes like rock salt (NaCl).

Therefore, CaS has the same value of Madelung constant (M) as that of NaCl (1.74756).

Hence, the Madelung constant (M) for CaS is also 1.74756.