CHMI onset next 8 assignment exto assignment ProblemID 81943534 1006 Online quiz

Question

CHMI onset next 8 assignment exto assignment ProblemID 81943534 1006 Online quiz#6: Chapter 9 Exercise 9.48 Resources previous l 14 of 15 next Use the Born-Haber cycle data from Appendix llB and the following table to calculate the lattice energy of Cao (Amab H for calcium is 178 ki/mol kJ/mol, EA 744 /molt IE 5900 /mol, IEh TABLE 9.1 Average Bond Energies Bond Energy Bond Energy Bond Energy Bond (kJ mol (kJ mol-1) Bond Bond (kJ mol-1) 436 163 237 414 418 218 389 946 193 464 222 208 368 590 175 565 272 51 200 323 243 159 297 30 347 142 450 26 523 203

Explanation / Answer

O2 --> 1/2O2 dHdiss = 498/2 = 249 kJ/mol

dHf CaO from literature = -635.5 kJ/mol

thus,

by Born-Haber cycle,

Feeding the values given above,

lattice energy = -635.5 - 178 - 590 - 1145 + 141 - 744 = -3151.5 kJ/mol for CaO

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