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Home Question Bank Chemistry Archive 2024 November 23

Chemistry Questions from Nov 23,2024

Browse the Chemistry Q&A Archive for Nov 23,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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1: Consider the mineral \( \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \). (i) What is the theoretical mass \( \% \) of each element in this compound? (ii) How many grams of Ca are there in 50.0 g of \( \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \) ? 1. Responde y argumente su respuesta. 1. ¿Cuál es la subpartícula que gira en las órbitas de un átomo? Se tiene un estanque con un volumen de \( 1000 \mathrm{~cm}^{3} \), este contiene 2 g de \( \mathrm{CO}_{2} \) y " x " gramos de \( \mathrm{O}_{2} \). El estanque se cierra y sufre un alza en su temperatura, llegando a los \( 761^{\circ} \mathrm{R} \) con una presión de 710 mmHg según el manómetro que tiene el estanque. Determinar la cantidad de oxígeno que hay dentro del estanque. Una masa de hidrógeno gaseoso ocupa un volumen de 230 litros en un tanque a una presión de 1.5 atmósferas y a una temperatura de \( 35^{\circ} \mathrm{C} \). Calcular a) ¿Cuántos moles de hidrógeno se tienen?, Una masa de hidrógeno gaseoso ocupa un volumen de 230 litros en un tanque a una presión de 1.5 atmósferas y a una temperatura de \( 35^{\circ} \mathrm{C} \). Calcular a) ¿Cuántos moles de hidrógeno se tienen?, b)¿ A qué masa equivale el número de moles contenidos en el tanque? Warning There is a checkbox at the bottom of the exam form that you MusT check prior to submitting this exam. Failure to do so may cause your work to be lost. Question 1(Multiple Choice Worth 4 points) ( 06.04 HC ) Bella observes that the gas-filled tire of her bicycle becomes a little deflated when she keeps the bicycle outside in cold weather. Which of the following laws is used to understand the behavior of the gas and why? The low temperature outside lowers the volume of the gas according to Charles's law because this law describes how a gas will behave at constant pressure. The low temperature outside lowers the volume of the gas according to Boyle's law because this law describes how a gas will behave when the number of moles remains constant. The the the gas according to Charles's law because this law describes how a gas will behave at constant pressure. Question outside increases the volume of the gas according to Boyle's law because this law describes how a gas will behave when the number of moles remains constant. 6) Cuónras moléculas de \( \mathrm{O}_{2} \) habrá en \( 64 \mathrm{~g}^{\text {? }} \) ? \( 2^{2} \) Questão: Dada uma equaçao \( 3 \mathrm{X}+\mathrm{Y} \rightarrow \mathrm{X}_{3} \mathrm{Y} \), considerando que seja uma reacão elementar, qual será a expressăo da lei da velocidade (Guldberg - Waage) mais apropriada? \( \quad(0,5 \) ponto) c. 65.39 g Zn to atoms of Zn [8-151] We can identify both radicals of salt ...........by one main reagent. \( \begin{array}{l}\text { a) } \mathrm{CuSO}_{4} \\ \text { b) } \mathrm{FeCO}_{3} \\ \text { c) } \mathrm{Hg}_{2} \mathrm{CO}_{3}\end{array} \) d) \( \mathrm{NaNO}_{3} \)
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