A reaction equation is given below. $\text{H}_2(g) + \tfrac{1}{2}\text{O}_2(g) \rightarrow \text{H}_2\text{O}(l) ;\ \Delta H = x\,\text{kJ mol}^{-1}$ Which pair of statements is entirely correct for this reaction?
- Aformation only; positive
- Bformation only; negative
- Ccombustion, formation; positive
- Dcombustion, formation; negative