Worksheet: Lattice Energies of Ionic Solids
In this worksheet, we will practice defining the lattice energy of an ionic solid and describing how its value varies with ion size and charge.
The precious gemstone ruby is aluminum oxide, , containing traces of . The compound is used in the fabrication of some semiconductor devices. Which of and has the larger lattice energy and why?
- AThe ionic charges in the two compounds are the same, so has the larger lattice enthalpy because is a smaller ion than .
- B has the larger lattice enthalpy because selenium has more electrons than oxygen, creating stronger mutual attraction between ions in the lattice.
- CWithout atomization, ionization, and electron affinity data, it is impossible to predict the order of lattice enthalpies.
- D has the larger lattice enthalpy because the ion is larger than the ion and so can interact with a greater number of ions.
- EThe ionic charges in the two compounds are the same, so has the larger lattice enthalpy because oxygen has a higher electron affinity than selenium.
The lattice energy of is 1,023 kJ/mol, and the distance is 201 pm. crystallizes in the same structure as but with a distance of 205 pm. Which of the following values most closely approximates the lattice energy of ?