Density of a unit cell is respresented as `rho = (" Effective no. of atoms (s)" xx "Mass of a unit cell ")/("Volume of a unit cell ")=(Z.M)/(N_(A).a^(3))` where , mass of unit cell =mass of effectuive no . of atoms(s) or ion (s). M= At . mass// formula `N_(A) `= Avogadro' s no . `rArr 6.0323 xx 10^(23)` a= edge lemght of unit cell Silver crystallizes in a facts lattice and has a density of `10.6 g//cm^(3)`. What is the length of a edge of the unit cell ?
A
`40.7 nm`
B
`0.2035 nm`
C
`0.101 nm`
D
`4.07 nm`
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The correct Answer is:
A
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Density of a unit cell is respresented as rho = (" Effective no. of atoms (s)" xx "Mass of a unit cell ")/("Volume of a unit cell ")=(Z.M)/(N_(A).a^(3)) where , mass of unit cell =mass of effectuive no . of atoms(s) or ion (s). M= At . mass// formula N_(A) = Avogadro' s no . rArr 6.0323 xx 10^(23) a= edge lemght of unit cell An elemetn crystallizes in a steucture having fcc unit cell of an edge 200 pm . Calculate the density , if 100 g of this element contains 12xx10^(23) atoms :
Density of a unit cell is respresented as rho = (" Effective no. of atoms (s)" xx "Mass of a unit cell ")/("Volume of a unit cell ")=(Z.M)/(N_(A).a^(3)) where , mass of unit cell =mass of effectuive no . of atoms(s) or ion (s). M= At . mass// formula N_(A) = Avogadro' s no . rArr 6.0323 xx 10^(23) a= edge lemght of unit cell The density of KBr is 2.75 g //cm^(-3) . The length of the edge of the unit cell is 645 pm .To which type of cubic crystal , KBr belongs ?
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