The standard enthalpy of formation of $\text{NO}_2(\text{g})$ is $+33.2\,\text{kJ mol}^{-1}$. The standard enthalpy of formation of $\text{N}_2\text{O}_4(\text{g})$ is $+9.2\,\text{kJ mol}^{-1}$. What is the standard enthalpy change for the reaction $2\text{NO}_2(\text{g}) \rightarrow \text{N}_2\text{O}_4(\text{g})$?
- A$-57.2\,\text{kJ mol}^{-1}$
- B$-24.0\,\text{kJ mol}^{-1}$
- C$+42.4\,\text{kJ mol}^{-1}$
- D$+75.6\,\text{kJ mol}^{-1}$