15) Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g)  2Li3N (s)

How many moles of lithium are needed to produce 0.50 mol of Li3N when the reaction is
carried out in the presence of excess nitrogen?
A) 0.30
B) 1.50
C) 0.20
D) 0.40
E) 3.6

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