A metal crystallises in a bcc lattice. Its unit cell edge length is about 300 pm and its molar mass is about 50g mol^(-1). What would be the density of the metal ("in" g"" cm^(-3)).

A metal crystallises in a bcc lattice. Its unit cell edge length is ab

1.	A metal crystallises in a bcc lattice. Its unit cell edge length is about 300 pm and its molar mass is about 50g mol^(-1). What would be the density of the metal ("in" g"" cm^(-3)).
Answer» 3.1 6.2 9.3 12.4 Solution :`a=300"pm", Z=2`(for bcc unit cell) `M=50 g"" mol^(-1)` `"Density", rho(ZtimesM)/(N_(A)TIMESA^(3)times10^(-30))g""cm^(-3)` `=(2times50)/(6.02times10^(23)times(300)^(3)times10^(-30))` `=100/(6.02times27times10^(-1))` `=1000/(6.02times27)=6.15 g cm^(-3)`