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A group IV A element with a density of 11.35 g/cm³ crystallizes in a face-centered cubic lattice whose unit cell edge length is 4.95 $\overset{o}{A}$ . Calculate its atomic mass.

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207 .2 g/mol

108 g/mol

109.9 g/mol

280.8 g/mol

answer is A.

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Detailed Solution

$d = \frac{GAM \times Z}{N_{A} \times a^{3}}$

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