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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!.
$_{20.18}Ne^{10}$. The molar mass tells how many grams are in a mole of atoms of that elements. So 6.02 $\times$ 1023 atoms of neon will have a mass of 20.108 grams. The following diagram illustrates how to calculate the mass of atoms by using their molar masses.