To get grams, we are going to convert the moles of N2 into grams of N2. We first need to know the grams/mol of N2. 14.01 g/mol is molar mass for Nitrogen (N), thus 28.02 g/mol N2.
We start with given, which is 2.20 moles of N2.
We then multiply by conversion factor of 28.02 g/mol N2.
(2.20 mol N2)(28.02 g/mol N2) = 61.64 grams of N2