How many moles of oxygen react with hydrogen to produce 18.5 mol of water

Question

Balenced equation: 2 H2O + O2 -> 2 H2O

Answer 1

Corrected reaction: 2 H₂ + O₂ --> 2 H₂O. Just use the mole ratio from this: (18.5 mol H₂O) * (1 mol O₂ / 2 mol H₂O) = 9.25 mol O₂.