Question

Rank the following ionic compounds by lattice energy Rank from highest to lowest lattice energy.

a- Na2O
b- MgO
c- Na2S
d- BeO
e- Licl

Answer 1

To rank ionic compounds by lattice energy, compounds with smaller ions and higher charges have higher lattice energies; BeO has the highest followed by MgO, Na2O, Na2S, and LiCl with the lowest.

Step-by-step explanation:

To rank the following ionic compounds by lattice energy from highest to lowest, we must consider the ionic charges and the internuclear distances. Lattice energy is directly proportional to the product of the ionic charges and inversely proportional to the internuclear distance of the ions in the compound. Here are the given compounds:

• Na2O
• MgO
• Na2S
• BeO
• LiCl

Considering that both charge and size influence lattice energy:

1. BeO (Be2+ and O2-; smaller ions with a higher product of charges)
2. MgO (Mg2+ and O2-; larger than BeO but with the same charges)
3. Na2O (Na+ and O2-; lower product of charges than BeO and MgO)
4. Na2S (Na+ and S2-; similar charges to Na2O but larger anion)
5. LiCl (Li+ and Cl-; lowest product of charges and larger internuclear distance)

In summary, compounds with smaller ions and higher charges tend to have higher lattice energies. Therefore, BeO will have the highest lattice energy followed by MgO, Na2O, Na2S, and LiCl with the lowest lattice energy.