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An element with molar mass 2.7xx10^-2 kg...

An element with molar mass `2.7xx10^-2 kg mol^-1` forms a cubic unit cell with edge length 405pm. If its density is `2.7xx103 kg m^-3`, what is the nature of the cubic unit celL?

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R G PUBLICATION-THE SOLID STATE-EXERCISE
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  4. An element crystallizes in a fcc unit cell with an edge length 200pm. ...

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