Question #fde10
1 Answer
Explanation:
1. Calculate the volume of the unit cell
Convert pm to cm
1 pm =
419 pm =
Volume of unit cell =
Volume of unit cell =
2. Determine the mass of the metal in the unit cell
Mass of metal in unit cell =
Mass of metal in unit cell =
3. Determine number of atoms per unit cell
We have face-centered unit cell:
Lattice points on the corner count for an 1/8 because they are shared with 8 other unit cells. Lattice points on the face count for 1/2 as they are shared with one other unit cell.
1/8 x 8 corners = 1 lattice point
1/2 x 6 faces = 3 lattice points
Total number of lattice points (atoms) per unit cell = 4
4. Calculate molar mass of unknown metal
Mass per atom = Total mass of metal in unit cell / number of atoms in unit cell
Mass per atom =
Mass per atom =
Use mass to determine molar mass by multiplying by Avogadro's number:
molar mass =
molar mass =
Looking at the periodic table, this molar mass is the closest to radon.