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An element A crystallises in fcc structu...

An element A crystallises in fcc structure. 200 g of this element has `4.12xx10^(24)` atoms. If the density of A is `7.2"g cm"^(-3)`, calculate the edge length of the unit cell.

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The correct Answer is:
299.9 pm
`rho=(Zxxm)/(a^3xx10^(-30))"or" a=((Zxxm)/(rhoxx10^(-30)))^(1//3)=(4xx200//(4.12xx10^24))/(7.2xx10^(-30))"pm"`=299.9 pm
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