Molar mass is a whole number multiple of the Empirical formula mass
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18g/mol
Molar Mass of Al: 2(27.0g/mol) = 54.0g/mol Molar Mass of O: 3(16.0g/mol) = 48.0g/mol Molar Mass of compound: 102.0g.mol (54.0g/mol / 102.0g/mol) x 100% = 52.9%
It is 4.0026 : the atomic mass can be a fraction.
It is 39.10
It is 38.96