Which equation represents the standard enthalpy of formation of liquid water?

1. A Option A: 2H₂(g) + O₂(g) → 2H₂O(l)
2. B Option B: H₂(g) + ½O₂(g) → H₂O(g)
3. C Option C: 2H(g) + O(g) → H₂O(l)
4. D Option D: H₂(g) + ½O₂(g) → H₂O(l)

Answer checked 11 October 2026 · How we write and check questions