Find the molar mass of an element that crystallizes forming a unit cell structure having an edge length of $4 \times 10^{-8} \ cm$ and containing $4$ particles. (Density $\rho = 19.7 \ g \ cm^{-3}$)
- A$140.2 \ g \ mol^{-1}$
- B$189.8 \ g \ mol^{-1}$
- C$160.5 \ g \ mol^{-1}$
- D$220.0 \ g \ mol^{-1}$
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