5N₂H₄ + 2O₂ → 4H₂O + 3N₂ + 4NH₃.
How many liters of N₂H₄ gas at STP needed to react with 386.7g O₂?
a) 0.05 liters
b) 0.10 liters
c) 0.15 liters
d) 0.20 liters