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Question: A group IV A element with a density of 11.35 g/cm<sup>3</sup> crystallise in a face centered cubic l...

A group IV A element with a density of 11.35 g/cm3 crystallise in a face centered cubic lattice whose unit cell edge length is 4.95Å. Calculate its atomic mass -

A

207.2 g/mol

B

180 g/mol

C

109.9 g/mol

D

280.8 g/mol

Answer

207.2 g/mol

Explanation

Solution

d = GAM×ZNA×a3\frac{GAM \times Z}{N_{A} \times a^{3}}

For FCC, Z = 4

GAM = 207.2 g/mol