Homework Help: chemistry

Posted by andrew on Monday, September 29, 2008 at 9:41pm.

Assume that the entire mass of an atom is concentrated in its nucleus, a sphere of a radius 1.5 x 10 to the -5 pm. If the mass of the atom is 2.39 x 10 to the -22 g, what is the density?

chemistry - GK, Monday, September 29, 2008 at 10:51pm
Volume of a sphere:
V = (4/3)πr³
π=3.14, and r = 1.5x10^-17m
Find the volume of the nucleus in m^3
1 m^3 = 1x10^6 cm^3
Convert the volume to cm^3
Substitute M in grams and V in cm^3 into:
D = M/V
The units of density are grams/cm^3

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