Chemistry Questions from Nov 06,2024

Browse the Chemistry Q&A Archive for Nov 06,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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5) Un gas ideal se encuentra encerrado en un recipiente de 10 litros a \( 16,4 \mathrm{~atm} \) y \( 127^{\circ} \mathrm{C} \). ¿Cuántos moles están contenidas en el recipiente? 2) Se mezclan 60g de azúcar con 240g de agua. ¿Cuál es el \% de masa de la solución? Ethyne \( \left(\mathrm{C}_{2} \mathrm{H}_{2}(\mathrm{~g}), \Delta H_{\mathrm{f}}=226.77 \mathrm{~kJ} / \mathrm{mol}\right) \) undergoes complete combustion in the presence of oxygen to produce carbon dioxide \( \left(\mathrm{CO}_{2}(\mathrm{~g}), \Delta H_{\mathrm{f}}=-393.5 \mathrm{~kJ} / \mathrm{mol}\right) \) and water \( \left(\mathrm{H}_{2} \mathrm{O}(\mathrm{g}), \Delta H_{\mathrm{f}}=-241.82 \mathrm{~kJ} / \mathrm{mol}\right) \) according to the equation below. \[ 2 \mathrm{C}_{2} \mathrm{H}_{2}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 4 \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \] What is the enthalpy of combustion (per mole) of \( \mathrm{C}_{2} \mathrm{H}_{2}(\mathrm{~g}) \) ? Use \( \Delta H_{\text {rnn }}=\sum\left(\Delta H_{\text {f,prowucts }}\right)-\sum\left(\Delta H_{\text {f, reactants }}\right) \). \( -2511.2 \mathrm{~kJ} / \mathrm{mol} \) \( -1255.6 \mathrm{~kJ} / \mathrm{mol} \) \( -862.1 \mathrm{~kJ} / \mathrm{mol} \) \( -431.0 \mathrm{~kJ} / \mathrm{mol} \) Hund's Rules declare that single electrons in different half-filled orbitals within the same subshell of an atom will each have the same spin. True False Hund's Rules declare that atoms and ions preferentially entirely fill an orbital within a subshell before moving on the the next orbital in that subshell True False \begin{tabular}{l} ¿Qué cambios de estado se ven involucrados durante el proceso de tiofilización? \\ \hline ¿Qué factores se modifican para que se lleve a cabo la liofilización? \\ \hline ¿A qué crees que se debe que este proceso consume mucha energía? \\ \hline\end{tabular} Current Attempt in Progress Bomb calorimetry is the classic method for determining the calories in our foods. A 1.50 g sample of pure sucrose is burned in a bomb calorimeter that has a heat capacity of \( 8.930 \mathrm{~kJ} /{ }^{\circ} \mathrm{C} \). The temperature of the water jacket rises from \( 24.00^{\circ} \mathrm{C} \) to \( 26.77^{\circ} \mathrm{C} \). What is \( \triangle E \) for the combustion of 1 mol of sucrose, \( \mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11} \) ? i i \( \quad \mathrm{kJ} \mathrm{mol}{ }^{-1} \) Your Turn 21! A bomb calorimeter has a heat capacity of \( 2.47 \mathrm{~kJ} / \mathrm{K} \). When a \( 3.74 \times \) \( 10^{-3} \mathrm{~mol} \) sample of ethylene was burned in this calorimeter, the temperature increased by 2.14 K . Calculate the energy of combustion for one mole of ethylene. A. \( -5.29 \mathrm{~kJ} / \mathrm{mol} \) B. \( \quad 5.29 \mathrm{~kJ} / \mathrm{mol} \) C. \( -148 \mathrm{~kJ} / \mathrm{mol} \) D. \( -1410 \mathrm{~kJ} / \mathrm{mol} \) E. \( \quad 1410 \mathrm{~kJ} / \mathrm{mol} \) Your Turn 21! A bomb calorimeter has a heat capacity of \( 2.47 \mathrm{~kJ} / \mathrm{K} \). When a \( 3.74 \times \) \( 10^{-3} \mathrm{~mol} \) sample of ethylene was burned in this calorimeter, the temperature increased by 2.14 K . Calculate the energy of combustion for one mole of ethylene. A. \( -5.29 \mathrm{~kJ} / \mathrm{mol} \) B. \( \quad 5.29 \mathrm{~kJ} / \mathrm{mol} \) C. \( -148 \mathrm{~kJ} / \mathrm{mol} \) D. \( -1410 \mathrm{~kJ} / \mathrm{mol} \) E. \( \quad 1410 \mathrm{~kJ} / \mathrm{mol} \) Chemical Reaction 1: Acid + Alkali \( \rightarrow \) Salt + Water a) Hydrochloric acid + sodium hydroxide \( \rightarrow \) Sodiul Chlor|de + wat b) Sulfuric acid + sodium hydroxide \( \rightarrow \) + water
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