J.R. S. answered 11/08/20
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2Na3N ==> N2 + 6Na ... balanced equation
N2 and Na are produced in a ratio of 1 mol N2 to 6 mol Na. Using this and dimensional analysis, we have:
28.2 g N2 x 1 mol N2 / 28 g x 6 mol Na / 1 mol N2 x 23.0 g Na/mol Na = 139 g Na