# Worksheet: Density of a Cubic Lattice

In this worksheet, we will practice calculating the density of a cubic lattice using the molecular formula, lattice parameters, and Bravais lattice type.

**Q2: **

Lithium hydride crystallizes with the same type of cubic lattice as sodium chloride. The edge length of the unit cell is 4.083 Å. Assume that there is contact between the hydride ions along the face diagonal of the unit cell.

Calculate to 3 significant figures the radius of a hydride ion in this structure.

Calculate to 3 significant figures the density of lithium hydride.

**Q3: **

Magnesium oxide crystallizes with the same type of cubic lattice as sodium chloride. The edge length of the unit cell is 4.212 Å. Assume that there is contact between the oxide ions along the face diagonal of the unit cell.

Calculate the radius of an oxide ion in this structure.

Calculate the density of magnesium oxide.

**Q6: **

and both have face-centered cubic unit cells. The unit cell of has an edge length of 0.514 nm, while the unit cell of has an edge length of 6.28 Å. There is contact between the potassium and chloride ions along the edge of the cell and between the chloride ions along the face diagonal of the cell. Assume that the chloride ions have the same radii in the two salts.

Calculate the radius of a chloride ion in .

Calculate the radius of a potassium ion in .

Calculate the density of .

Calculate the density of .