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The density of solid argon is (2)/(3) ("...

The density of solid argon is `(2)/(3) ("amu"//Å^(3))` at 40K. If the Argon atom is assumed to be sphere to radius `(3)/(pi^(1//3)) Å`, what percentage of solid Argon is apparently withput anything ?

A

0.2

B

0.4

C

0.6

D

0.8

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