Strontium oxide \( (\mathrm{Sr} 0) \) crystal has cubic structure and has density \( 5 \mathrm{~...

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Strontium oxide \( (\mathrm{Sr} 0) \) crystal has cubic structure and has density \( 5 \mathrm{~g} \mathrm{~cm}^{-3} \). If edge of the unit cell has length \( 520 \mathrm{pm} \), calculate the number of SrO formula units in each unit cell. (Atomic mass of \( \mathrm{Sr}=88 \) )
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