Automotive air bags inflate when sodium azide NaN3 decomposes. In preparation of the airbag a scientist reacts sodium with nitrogen to obtain sodium azide:
A) Balance the chemical reaction of this process:

Na (s) + ___N2 (g) → ___NaN3 (s)
B) If 50.0 g of sodium is reacted with 40.5 g of nitrogen according to the balanced chemical
reaction above what is the mass of sodium azide that can be obtained?
C) What is the limiting reagent in the reaction?
D) How much excess reagent left over when the reaction is complete?
E) What is the percent yield if the scientist obtained 34.5 g of sodium azide? Was this reaction
successful?