Both equation I and II are balanced, but equation II is the correct way to write the balanced equation. Why do you think this is? (Hint: Think fractions.)

I) 2 SnO₂ + 4 H₂ → 2 Sn + 4 H₂O
II) SnO₂ + 2 H₂ → Sn + 2 H₂O