Sodium forms bcc structure. The molar mass of sodium is 23 g/mol. What is the mass of 3 unit cells of sodium?

Step-by-step solution

For a bcc structure, the number of atoms per unit cell is Z = 2 . The mass of one atom of sodium is M N_A , where M = 23 g/mol and N_A = 6.022 10²³ mol ⁻¹ . The mass of one unit cell is Z M N_A = 2 23 6.022 10²³ g. The mass of 3 unit cells is 3 2 23 6.022 10²³ g. = 138 6.022 10²³ g = 22.915 10⁻²³ g = 2.2915 10⁻²² g Answer: 2.2915 10⁻²² g