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# Problem: The ionic substance strontium oxide, SrO, forms from the direct reaction of strontium metal with molecular oxygen. The arrangement of the ions in solid SrO is analogous to that in solid NaCl and is shown here.The experimental density of SrO is 5.10 g/cm3. Based on the ionic radii in the figure below, predict the length of the side of the cube in the figure. Given your answer, what is the number of formula units of SrO that are contained in the cube in the figure?

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###### Problem Details

The ionic substance strontium oxide, SrO, forms from the direct reaction of strontium metal with molecular oxygen. The arrangement of the ions in solid SrO is analogous to that in solid NaCl and is shown here.

The experimental density of SrO is 5.10 g/cm3. Based on the ionic radii in the figure below, predict the length of the side of the cube in the figure. Given your answer, what is the number of formula units of SrO that are contained in the cube in the figure?