Homework Help: Inorganic Chemistry

Posted by Stephanie on Sunday, October 15, 2006 at 7:55pm.

The atoms in barium metal are arranged in a body centered cubic unit cell. Calculate the radius of a barium atom in A if the density of barium is 3.50g/cm3. The atomic weight of barium is 137.34.

The atoms in barium metal are arranged in a body centered cubic unit cell. Calculate the radius of a barium atom in A if the density of barium is 3.50g/cm3. The atomic weight of barium is 137.34.

The body centered cubic structure has two atoms per unit cell; therefore, the mass of Ba in a unit cell is (2 x 137.34)/6.023 x 10^23 = ??g.
vol = mass/d = ??g/3.50 g/cc = xx cc.

The edge length of a cube then is the cube root of xx cc or
(xx cc)^1/3 = a

The body diagonal is 4 x the radius and equals a*1.732; therefore r = (a*1.732)/4.
Just for a check, I obtained 2.20 A. My periodic table lists 1.98 A. Check my thinking. Check my arithmetic.

No one has answered this question yet.

Answer this Question

Related Questions

chemistry - This problem is from my chemistry book and I am having a little ...
Gen Chem - Barium has a radius of 224 pm and crystallizes in a body-centered ...
CHEM - Info: The atoms of crystalline solid pack together into a three-...
Chemistry - The density of solid W is 19.3 g/cm3. How many atoms are present per...
chemistry - Gallium crystallizes in a primitive cubic unit cell. The length of ...
Chemistry - The mass of a single barium atom is 2.28E-22 grams. How many barium ...
Chemistry - The mass of a single barium atom is 2.28E-22 grams. How many barium ...
CHEM**** - Initial info: The atoms of crystalline solid pack together into a ...
chemistry - Sketch one face of a simple cubic unit cell of side a for the case ...
chemistry - I have a unit cube question to which the answer is given that I'...

For Further Reading

First Name:
School Subject:
Answer: