# NEET Chemistry The Solid State Questions Solved

An element ‘X’ (At. mass = 40 g mol–1) having f.c.c. structure, has unit cell edge length of 400 pm. Calculate the density of ‘X’ and the number of unit cells in 4 g of ‘X’.$\left({N}_{A}=6.022×{10}^{23}mo{l}^{-1}\right)$

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