Homework Help: Chemistry

Posted by Anna on Monday, May 3, 2010 at 7:37pm.

An element crystallizes in a body-centered 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

Chemistry - Anna, Monday, May 3, 2010 at 7:49pm
95.4g/mol
Chemistry - DrBob222, Monday, May 3, 2010 at 8:19pm
The bcc has two atoms/unit cell.
The edge is 3.5 x 10^-8 cm = a
Volume = a³ = 3.5 x 10^-8)^3 cc
mass = volume x density
mass = a³ x 7.49 g/cc = xx
2atoms/unit cell x atomic mass/6.022 x 10^23 = xx mass
Solve for atomic mass.
Chemistry - DrBob222, Monday, May 3, 2010 at 8:20pm
I made a typo. The density is 7.39, not 7.49 g/cc.

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