This question is about enthalpy changes. A student wanted to use Hess's Law to determine the enthalpy change, $$\(\Delta_{\mathrm{r}} H_{1}\)$$, in $$\(\mathrm{kJ} \mathrm{mol}^{-1}\)$$, for Reaction 1. (a) Explain why $$\(\Delta_{r} H_{1}\)$$ can also be described as an enthalpy change of formation. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

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