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Home Question Bank Chemistry Archive 2024 November 03

Chemistry Questions from Nov 03,2024

Browse the Chemistry Q&A Archive for Nov 03,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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When a 0.079 M aqueous solution of a certain acid is prepared, the acid is \( 23 . \% \) dissociated. Calculate the acid dissociation constant \( K_{a} \) of the acid. Round answer to 2 significant digits. In an aqueous solution of a certain acid the acid is \( 0.35 \% \) dissociated and the pH is 3.52 . Calculate the acid dissociation constant \( K_{\mathrm{a}} \) of the acid. Round your answer to 2 significant digits. \( K=\square \) Cierta molécula tiene una masa de \( 4.5 \times 10^{-6} \) gramos. ¿Cuál es la masa de \( 8 \times 10^{8} \) moléculas Expresar el resultado en kilogramos \( (1 \mathrm{~kg}=1000 \) gramos \( ) \) tiempo?. 4. Escribe las expresiones de la velocidad media para las siguientes reacciones: a) \( 2 \mathrm{Fe}+6 \mathrm{HCl} \rightarrow 2 \mathrm{FeCl}_{3}+3 \mathrm{H}_{2} \) b) \( \mathrm{N}_{2} \mathrm{O}_{4} \rightarrow 2 \mathrm{NO}_{2} \) c) \( 2 \mathrm{NaBr}^{2}+4 \mathrm{HNO}_{3} \rightarrow \mathrm{Br}_{2}+2 \mathrm{NO}_{2}+2 \mathrm{NaNO}_{3}+2 \mathrm{H}_{2} \mathrm{O} \) ¿cuantos át. de Oxigeno se requiere para formar 5 grs de 02?? 7. Em um cicloalcano constituído por 5 átomos de carbono, a adição de um átomo de cloro (Cl), ganha o nome de cloração, desenhe essa reação: \( \left(\mathrm{C} 5 \mathrm{H}_{10}\right)+\mathrm{Cl} \) : 6. Na reação de substituição heterolíticas, qual ordem de facilidade de saída do átomo de hidrogênio? Desenhe essa reação em forma decrescente de facilidade: 8) Ordinary brass contains \( 61.6 \% \) copper, \( 2.9 \% \) lead, \( 0.2 \% \) tin and \( 35.3 \% \) zinc. How many pounds of each metal would be in 160 lb . of brass? 18. In a lab experiment which was done with a barometric pressure of 1.043 atm , some H 2 was collected over water at \( 27.0^{\circ} \mathrm{C} \). What is the partial pressure of the "dry" H 2 in the container? 19. "Mixed-air" divers often use standard air ( \( 78 \% \mathrm{~N} 2,21 \% \mathrm{O}, 1 \% \) Ar) which has been enriched to \( 32 \% \mathrm{O} \). As the dive tender aboard a marine science research vessel, it is your responsibility to fill scuba tanks with the proper air mix. A 12.5 L (internal volume) scuba tank is pressurized to 2550 psi with standard air. You add pure oxygen to the tank. What must the final pressure be so that the air has a composition of \( 32 \% \mathrm{O} \) ? . All measurements are made at \( 25.0^{\circ} \mathrm{C} \). 17. 75.0 mL of a gas was collected over water at \( 22.0^{\circ} \mathrm{C} \) and 749.8 torr. What will the volume of the "dry" gas be at STP?
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