Answer
217ppm
Work Step by Step
3.62=2(137.654)/(6.022x10^23)(a^3)
a^3=274.654/(6.022x10^23)(3.63)
a=cube root of 274.654/2.1860x10^42
a=5.0085x10^-8
r=sq. root of 3(5.0085x10^-8)/4
r=2.1687x10^-8 (radius of barium)
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