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1. Dry air at normal temperature and pressure has a mass density of 0.0012g/cm3 with a mass fraction of oxygen of 0.23. Calculate the atom

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1. Dry air at normal temperature and pressure has a mass density of 0.0012g/cm3 with a mass fraction of oxygen of 0.23. Calculate the atom density (atom/cm 3) of 18O. ANS: 2.11921016 atoms 18O/cm3

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