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Molar mass nitrogen ( N2 ) = 28.02 g/mol. 1 mol N2 -------> 28.02 g. 4.60 mol ---------> x g. x = 4.60 * 28.02. x = 129 g of N2. hope this helps!.
Water vapor and dry air density calculations at 0 Â°C: 1  The molar mass of water is 18.02 g/mol, as calculated from the sum of the atomic masses of its constituent atoms. 2  The average molecular mass of air (approx. 78% nitrogen, N2; 21% oxygen, O2; 1% other gases) is 28.57 g/mol at standard temperature and pressure (STP).