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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:
2NO2( g) →2NO(g) +O2( g)  From the standard reaction enthalpies of N2( g) +O2→2NO(g) ΔH∘=+180.5 kJ⋅mol−12NO2( g) →N2( g) +2O2( g) ΔH∘=−66.4 kJ⋅mol−1\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

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