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b) An element crystallizes in a foc latt...

b) An element crystallizes in a foc lattice. The edge length of the unit cell is 400 pm. Calculate the density of the unit cell. `("molar mass"="60 g mol"^(-1))`
`("Avogadro number"=6.02 xx 10^(23))` 

Text Solution

Verified by Experts

`d=(zM)/(a^(3)N_(A))`
`"Given, In FCC"`
`Z=4, M="60 g mol"^(-1), a="400 pm "=400xx10^(-10)cm^(3)`
`d=("4 atomz "xx"60 g mole"^(-1))/((400xx10^(-10)cm)^(3)xx(6.023xx10^(23)" atoms mol"^(-1)))`
`=6.226g cm^(-3)`
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