JEE Main Chemistry question

Chemistry The Solid State JEE Main

Not in JEE Main or NEET syllabus

At room temperature, sodium crystallises in a body centered cubic lattice with Å. The theoretical density of sodium (At. wt. of Na ) is:

(A)Correct
(B)
(C)
(D)None of these

Answer: (A)

Solution

For a bcc lattice, , so \dfrac{ZM}{N_A a^3}\dfrac{2×23}{6.023×10^{23}×(4.24×10^{-8})^3}\dfrac{46}{6.023×10^{23}×7.623×10^{-23}}\dfrac{46}{45.91}$ ≈

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Question ID VK-141655