Which equation shows the reaction for which the standard enthalpy change is the standard enthalpy change of formation of water?
- A$2\text{H}_2\text{(g)} + \text{O}_2\text{(g)} \rightarrow 2\text{H}_2\text{O(l)}$
- B$\text{H}_2\text{(g)} + \tfrac{1}{2}\text{O}_2\text{(g)} \rightarrow \text{H}_2\text{O(l)}$
- C$\text{H}^+\text{(aq)} + \text{OH}^-\text{(aq)} \rightarrow \text{H}_2\text{O(l)}$
- D$2\text{H(g)} + \text{O(g)} \rightarrow \text{H}_2\text{O(l)}$