2NH3(g) + 5F2(g) → N2F4(g) + 6HF(g)

Determine the theoretical yield of HF, in grams, when 69.10 g of NH3 reacts with 69.10 g of F2.
g HF

What is the percent yield if 8.630 g hydrogen fluoride (HF) is actually formed during the reaction?
%