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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!.
In short, the molar mass is the mass of one mole of any particular substance. In the SI units system a mole is defined by the amount of carbon atoms there are in 12g of carbon-12 (the nucleus of a carbon-12 atom contains 6 protons and 6 neutrons, hence carbon-12).