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Al crystallizes in FCC structure. Calculate the molar mass of Al atoms, if length of the unit cell is 404 pm and density of Al is 2.7 g/cm3 .  

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Given: Density (d) = 2.7 g/cm

 Length of unit cell (a) = 404 pm 

 = 4.04 x 10−8 cm z = 4 (FCC) 

To find: Atomic mass of element (M) =? 

Formula: i. V = a

Calculation: 

From formula (i),

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