Calculate the Standard Reaction Enthalpy for the Following Reaction A) -1141 KJ

question 126

Multiple Choice

Calculate the standard reaction enthalpy for the following reaction:
$\begin{array}{ll}2 \mathrm{NO}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NO}(\mathrm{g}) +\mathrm{O}_{2}(\mathrm{~g}) \\\text { From the standard reaction enthalpies of }\\\mathrm{N}_{2}(\mathrm{~g}) +\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}(\mathrm{g}) & \Delta H^{\circ}=+180.5 \mathrm{~kJ} \cdot \mathrm{mol}^{-1} \\2 \mathrm{NO}_{2}(\mathrm{~g}) \rightarrow \mathrm{N}_{2}(\mathrm{~g}) +2 \mathrm{O}_{2}(\mathrm{~g}) & \Delta H^{\circ}=-66.4 \mathrm{~kJ} \cdot \mathrm{mol}^{-1}\end{array}$

• A) -114.1 kJ.mol^-1
• B) -246.9 kJ.mol^-1
• C) +114.1 kJ.mol^-1
• D) -294.6 kJ.mol^-1
• E) +246.9 kJ.mol^-1