Chemistry
posted by Anna .
An element crystallizes in a bodycentered cubic lattice. The edge of the unit cell is 3.5 Angstrom, and the density of the crystal is 7.39g/cm^3. Calculate the atomic weight of the element. A= ? g/mol

95.4g/mol

The bcc has two atoms/unit cell.
The edge is 3.5 x 10^8 cm = a
Volume = a^{3} = 3.5 x 10^8)^3 cc
mass = volume x density
mass = a^{3} x 7.49 g/cc = xx
2atoms/unit cell x atomic mass/6.022 x 10^23 = xx mass
Solve for atomic mass. 
I made a typo. The density is 7.39, not 7.49 g/cc.