Answer to Question #161072 in General Chemistry for betty

Question

When heated, lithium reacts with nitrogen to form lithium nitride: (4 points) Li(s) + N2(g) ----------> Li3N(s) What is the theoretical yield of Li3N in grams when 12.3 g of Li are heated with 33.6 g of N2? If the actual yield of Li3N is 5.89 g, what is the percent yield of the reaction?

Answer 1

6Li + N₂ = 2Li₃N

$\nu$ (Li)=m/M=12.3/7=1.76 mol

$\nu$(N₂)=33.6/28= 1.2 mol

$\nu$(Li₃N)= 1.76*2/6=0.59 mol

m(Li₃N)= 0.59*35=20.65 g

$\eta$ = m_p/m_t*100%=5.89/20.65*100%=29%