Homework Help: chemistry

Posted by amanda on Sunday, December 4, 2011 at 9:49pm.

a metal crystallizes in the face centered cubic crystal structure with a unit cell edge of 5.48 x10 power of -8 cm. the density of the metal is 6.90 g per cubic cm.
a. what is the mass (g) of a single atom of this element.
b. what is the atomic weight of the element (g per mol).
c. what is the radius, in cm, of an atom of the element..

thank you..

chemistry - DrBob222, Monday, December 5, 2011 at 11:14am
edge^3 = volume
mass = volume x density
fcc = 4atoms/unit cell so mass/4 = mass 1 atom
1 atom x 6.02E23 = atomic mass.
4*radius = edge*2^{1/2</sup

Post your work if you get stuck.}
chemistry - amanda, Monday, December 5, 2011 at 4:18pm
can u please explain to me where did u get 2 to find radius?..

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