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(a) AB crystallises in a rock salt struc...

(a) AB crystallises in a rock salt structure with `A:B=1:1`. The shortest distance between A and B is `y^(1//3)` nm. The formula mass of AB is 6.022 Y amu where Y is any arbitrary constant. Find the density in kg `mol^(-1)` .
(b) If measured densisty is 20 kg `mol^(-1)`, identify the type of point defect.

Text Solution

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(a) Density `= (4xx6.023xx y)/(6.023xx10^(23)xx8xx y xx10^(-27)) ["Since "a=2y^(1//3)]=5xx10^(3)g//m^(3)=5Kg//m^(3)`
(b) Since the density (calculated) `gt` density (observed), it means the defect is metal excess defect.
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