MHT CET Chemistry question

Chemistry The Solid State MHT CET

Not in JEE Main or NEET syllabus

Aluminium has fcc structure. The length of the unit cell is 404 pm. If the density of the metal is 2.7 g cm, the molar mass of Al atom is

(A)28 g mol
(B)30 g mol
(C)26.80 g molCorrect
(D)25 g mol

Answer: (C)

Solution

\dfrac{ρ N_A a^3}{Z}\dfrac{2.7 × 6.022×10^{23}×(4.04×10^{-8})^3}{4}$ = 26.80\

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Question ID VK-043177