H₂ + F₂ → 2 HF

In the reaction represented above, what mass of HF is produced by the reaction of 3.0 x 10²³ molecules of H₂ with excess F2? (Assume the reaction goes to completion.)
a) 1.5 g
b) 3.0 g
c) 6.0 g
d) 9.0 g