Density Calculations PDF

For second year chemistry branch For second year chemistry branch  Density Calculations The crystal is the repetition of unit cell. The density of a crystalline material ρ =(number of atoms in the unit cell, n) x (mass of atom, m) / (volume of cell, v) - Atoms in the unit cell, N=...

For second year chemistry branch For second year chemistry branch  Density Calculations The crystal is the repetition of unit cell. The density of a crystalline material ρ =(number of atoms in the unit cell, n) x (mass of atom, m) / (volume of cell, v) - Atoms in the unit cell, N= (BCC* 2),(FCC* 4), (HCP* 6) - Mass of atom, m=atomic weight, a (g/mol or amu) in preodic table. - To change from amu to grams= the atomic weight in amu / avogadro number - NA=6.023x1023 atoms/mol Volume of unit cell Vc=a3 - a=2R√2 (FCC), a=4R√3 (BCC), a=2R (SC) - R = atomic radius