Aluminum Oxide Al2O3 is used in the purification of water. It is an electrical insulator also used as a substrate for integrated circuits. For a cylindrical shape of 1 um diameter and 30 cm length, what is the number of Al2O3 molecules? Given the density of Al2O3 is 3.97 g/cm³, MAI 26.98 g/mole, Mo = 16 g/mole and Avogadro's number NA = 6.023 x 1023 atoms/mole or molecules/mole. = O 2.21 x 1010 molecules O 1.11 x 1010 molecules 055 1010 molecules

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