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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!.
The molar mass for sodium bromide is 102,9 g/mol. nNaBr= 16,6 g/ 102,9 g/mol = 0,16 moles. The concentration of the solution is therfore = 0,16 moles/ 1,330 kg = 0,12 molal. -While the above is true it should 0.121 molar due to significant digits (just a technicality).