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Assuming that the number "9.871023" would or should have been written as "9.87 X 1023" if the typographical resources to do so were available to the questioner:

Avogadro's Number, which is the number of formula units in a mole of any material, is about 6.022 X 1023. The gram formula mass for aluminum oxide is 101.96. Therefore, the mass of the stated number of formula units of aluminum oxide is:

101.96(9.87/6.022) or about 164 grams, to the justified number of significant digits.

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Q: What is the mass of 9.871023 formula units of aluminum oxide?

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