FeO crystallizes in the cubic system, in which there is P four form...

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FeO crystallizes in the cubic system, in which there is
P four formula units in each unit cell. The density of the

W crystal is \( 4.0 \mathrm{~g} / \mathrm{cm}^{3} \). The side length of each unit cell is \( \left(\mathrm{Fe}=56, \mathrm{~N}_{\mathrm{A}}=6 \times 10^{23}\right) \)
(A) \( 4.227 \stackrel{\circ}{\mathrm{A}} \)
(B) \( 2.424 \stackrel{\circ}{\mathrm{A}} \)
(C) \( 4.932 \stackrel{\circ}{\mathrm{A}} \)
(D) \( 2.974 \stackrel{\circ}{\mathrm{A}} \)
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