Question

# CsBr crystallizes in a body-centred cubic lattice of unit cell edge length $$436.6$$ pm. Atomic masses of Cs and Br are $$133$$ amu and $$80$$ amu respectively. The density (in g cm$$^{-3}$$) of CsBr is :

A
8.50
B
4.25
C
42.5
D
0.425

Solution

## The correct option is A $$8.50$$For bcc, z=4The formula for density is given below:$$\displaystyle \text{Density}=\frac{z\times M}{a^3\times N_0}$$$$\displaystyle=\frac{2\times213}{(4.366\times10^{-8})^3\times6.02\times10^{23}}$$ $$=8.50$$ g cm$$^{-3}$$Hence, the correct option is $$\text{A}$$Chemistry

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