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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!.
Thus, it is expected that the mass of the molecule would be the sum of the masses of sodium, oxygen and hydrogen. This is the molar mass of sodium hydroxide. The unit of this mass is gram per mole. However, when this mass is shown in grams instead of atomic mass unit, it is known as a mole. The atomic masses of sodium, oxygen and hydrogen are 23, 16 and 1 respectively. The molar mass is, therefore, 23 plus 16 plus 1, which is 40.