The density of argon (face centered cubic cell) is \( 1.83 \mathrm{~g} / \mathrm{cm}^{3} \) at \...

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The density of argon (face centered cubic cell) is \( 1.83 \mathrm{~g} / \mathrm{cm}^{3} \) at \( 20^{\circ} \mathrm{C} \). What is the length of an edge a unit cell? (Atomic mass : Ar = 40)
(a) \( 0.599 \mathrm{~nm} \)
(b) \( 0.569 \mathrm{~nm} \)
(c) \( 0.525 \mathrm{~nm} \)
(d) \( 0.551 \mathrm{~nm} \)
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