Aluminium has fcc structure. The length of the unit cell is 409 pm. If the density of the metal is `2.7 g" " cm^(-3)`, the molar mass of Al atom is
Aluminium has fcc structure. The length of the unit cell is 409 pm. If the density of the metal is `2.7 g" " cm^(-3)`, the molar mass of Al atom is
A. `28gmol^(-1)`
B. `30gmol^(-1)`
C. `26.80gmol^(-1)`
D. `25gmol^(-1)`
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Correct Answer - C
`M=(da^3N_A)/(Z) = (2.7xx10^(-10)^3xx6.023xx10^23)/(4)`
`=26.80gmol^(-1)`
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