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A compound AB has a cubic structure and ...

A compound AB has a cubic structure and molecular mass 99. Its density is 3.4 g `cm^(-3)` . What is the length of the edge of the unit cell ?

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Simple cubic structure molecular mass = 99
`rho=3.4g//cm^(3)`
Edge length = ?
`rho=(ZxxM)/(a^(3)xxN_(A))g//cm^(3)`
`3.4=(1xx99)/(a^(3)xx6.023xx10^(23))`
`a^(3)=(99)/(3.4xx6.023xx10^(23))`
`a=3.64xx10^(-8)cm`
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