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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!.
Sodium bromide has a molar mass 102.9 g mol^(-1), which means that one mole of sodium bromide has a mass of 102.9 g. You can thus use the molar mass of a compound to convert between its mass and the number of moles equivalent to that mass.