Density of solid Argon at 40 K is1.65g/m...

Density of solid Argon at 40 K is1.65g/mL. If the radius of Argon atom is `1.54xx10^(-8)cm`.What percentage of solid argon is empty ? (At mass of Ar=40)

0.4

0.62

0.6

0.38

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