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Home Question Bank Chemistry Archive 2024 December 04

Chemistry Questions from Dec 04,2024

Browse the Chemistry Q&A Archive for Dec 04,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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A formula connecting density \( (d) \), mass \( (m) \) and volume \( (v) \) is \[ d=\frac{m}{v} \] \( m=30.14 \mathrm{~g} \) after being truncated to 2 d.p. \( v=3.78 \mathrm{~cm}^{3} \) after being truncated to 2 d.p. Calculate the lower and upper bounds of \( d \). Round your answers to \( 2 \mathrm{~d} . \mathrm{p} \). If 82 g of sugar is dissolved in 7950 mL of water, what is the concentration of the solution? При образовании 2,2г СО \( { }_{2} \) по уравнению реакции: \( \mathrm{C}(\mathrm{тв})+\mathrm{O}_{2}=\mathrm{CO}_{2}(\mathrm{r}) \) выделилось 19,7 кДж теплоты. Стандартная энтальпия образования \( \mathrm{CO}_{2}(\mathrm{r}) \) в кДж/ моль равна -197 +394 +197 \( -394 \times \) A partir de la siguiente ecuación de combustión de octano, si reaccionan 59.2 gramos de octano, ¿Cuántos gramos de Oxígeno se necesitan? \[ \mathrm{C}_{8} \mathrm{H}_{18}+25 / 2 \mathrm{O}_{2}-->8 \mathrm{CO}_{2}+9 \mathrm{H}_{2} \mathrm{O} \] Considera: \( \mathrm{C}: 12, \mathrm{O}: 16, \mathrm{H}: 1 \) A partir de la siguiente ecuación de combustión de octano, si reaccionan 59.2 gramos de octano, ¿Cuántos gramos de Oxígeno se necesitan? \[ \mathrm{C}_{8} \mathrm{H}_{18}+25 / 2 \mathrm{O}_{2}-\cdots>8 \mathrm{CO}_{2}+9 \mathrm{H}_{2} \mathrm{O} \] Considera: \( \mathrm{C}: 12, \mathrm{O}: 16, \mathrm{H}: 1 \) A chemist carefully measures the amount of heat needed to raise the temperature of a 510.0 mg sample of a pure substance from \( 2.9^{\circ} \mathrm{C} \) to \( 23.7^{\circ} \mathrm{C} \). The experiment shows that 25.9 J of heat are needed. What can the chemist report for the specific heat capacity of the substance? Be sure your answer has the correct number of significant digits. A chemist carefully measures the amount of heat needed to raise the temperature of a 197.0 g sample of a pure substance from \( 49.4^{\circ} \mathrm{C} \) to \( 67.7^{\circ} \mathrm{C} \). The experiment shows that 16.9 kJ of heat are needed. What can the chemist report for the specific heat capacity of the substance? Be sure your answer has the correct number of significant digits. A chemist carefully measures the amount of heat needed to raise the temperature of a 0.58 kg sample of a pure substance from \( 57.4^{\circ} \mathrm{C} \) to \( 67.4^{\circ} \mathrm{C} \). The experiment shows that \( 27 . \mathrm{kJ} \) of heat are needed. What can the chemist report for the specific heat capacity of the substance? Be sure your answer has the correct number of significant digits. 1. (2.0 ptos.) ¿Qué volumen de LiOH 9.62 mM se necesita exactamente para neutralizar \( 2,500.00 \mu \mathrm{~L} \) de HF 0.128 M ? I nanotubi in carbonio sono strutture che possono avere una lunghezza di \( 0,000000015 \mathrm{~m} \). - Esprimi questa lunghezza in notazione scientifica.
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