Question

Sodium and nitrogen combine to form sodium nitride.
6Na(s)+N2(g)→2Na3N(s)

If 90.0 g of sodium is mixed with 40.0 g of nitrogen gas, what mass of sodium nitride forms?

Answer 1

Law of conservation of mass : mass will be conserved on product and reactant side.
Therefore 90 + 40 = 130g