Reese Burns
05/18/2024 · High School

11. a) Determina la entalpia de la reacclón en la que se forma 1 mol \( \mathrm{N}_{2} \mathrm{O}_{5} \) (g) a partir de los elementos que lo integran utilizando los sigulentes datos: \( \begin{array}{ll}\mathrm{N}_{2} \mathrm{O}_{5}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{I}) \rightarrow 2 \mathrm{HNO}_{3}(\mathrm{aq}) & \Delta H^{\circ}=-140,2 \mathrm{~kJ} \\ 2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{I}) & \Delta H^{\circ}=-571,7 \mathrm{~kJ} \\ \mathrm{~N}_{2}(\mathrm{~g})+3 \mathrm{O}_{2}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HNO}_{3}(\mathrm{aq}) & \Delta \mathrm{H}^{\circ}=-414,7 \mathrm{~kJ}\end{array} \) b) ¿Qué energía se desprende cuando se forman 10 g de \( \mathrm{HNO}_{3} \) a partir de sus elementos? Datos: Masas atómicas: \( \mathrm{H}=1 ; \mathrm{N}=14 ; \mathrm{O}=16 \)

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a) La entalpía de formación de \( \mathrm{N}_{2}\mathrm{O}_{5} \) es \( -274,5 \, \mathrm{kJ} \). b) La energía desprendida al formar 10 g de \( \mathrm{HNO}_{3} \) es aproximadamente \( -32,88 \, \mathrm{kJ} \).

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