The molar volume of a certain form of solid lead is 18 cm 3 /mol. Assuming cubic closest-packed structure, determine the following.
-The number of Pb atoms per unit cell
A) 3
B) 4
C) 10
D) 12
E) 14

Question

Quizplus · Accepted Answer

In a cubic closest-packed (ccp) structure, also known as face-centered cubic (fcc) structure, there are 4 atoms per unit cell. This structure consists of atoms at each of the eight corners of a cube and one atom at the center of each of the six faces. The corner atoms are shared among eight unit cells and the face-centered atoms are shared between two, leading to a total of 4 atoms per unit cell.

The Molar Volume of a Certain Form of Solid Lead