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: \( \mathrm{H}=1 ; \mathrm{N}=14 ; \mathrm{O}=16 \)

Which of the following is an example of anionic interference in atomic emission spectroscopy? O Interference of high concentration of sodium ions in assay calcium ions. Interference by formation of less volatile salt with sulphat by calcium. Decreased drop size of the analyte solution by alcohols.

3.Un trozo de hierro de 50 gramos se calienta a \( 100^{\circ} \mathrm{C} \) y luego se pone en agua fria, donde su emperatura baja a \( 30^{\circ} \mathrm{C} \) ¿Cuantas calorias cede el hierro al egua? (Ce s \( \mathrm{e}^{\left.-0.11 \mathrm{cal} / \mathrm{g}^{\circ} \mathrm{C}\right)} \)

A metal is considered reactive if it easily loses electrons to achieve a stable octet. Would you prefer metal that readily loses electrons? How is this related to the metal's ionization energy? Would it be better for the metal to have high or low ionization energy?

Quanti grammi di soluto bisogna aggiungere a \( 50,0 \mathrm{~g} \) di una soluzione al \( 10,0 \% \mathrm{~m} / \mathrm{m} \) perché la sua concentrazione raddoppi?

Which of the following is the function of the atomiser in the emission system of Atomic Absorption Spectroscopy? To split the beam into two To break the steady light into pulsating light To break large mass of liquid into small drops To reduce the sample into atomic state