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Calculate the standard enthalpy change (ΔH°) for the phase transition reaction of ice to water, given that the enthalpy of fusion for ice is 6.01 kJ/mol and the specific heat capacity of water is 4.18 J/g·°C. Express your answer in kJ/mol.

asked Feb 3 in Chemical thermodynamics by CletaF793120 (2.8k points)

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1 answer 76 views

Calculate the standard electrode potential (E°) for the redox reaction of the following half-reactions:Cu2+(aq) + 2e- → Cu(s) E° = +0.34 VFe3+(aq) + e- → Fe2+(aq) E° = +0.77 V

asked Feb 3 in Chemical thermodynamics by BradyBassett (2.0k points)

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1 answer 30 views

Design a process for the purification of a sample of crude oil. Describe the steps and the equipment needed for the process. Also, provide a brief explanation of the principles behind each step.

asked Feb 4 in Chemical engineering by DominickPlum (2.5k points)

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1 answer 25 views

Here's a specific problem for the student to solve:Consider the reaction A(g) + B(g) ↔ C(g) with a standard enthalpy change of reaction (ΔH°rxn) of -50 kJ/mol at 298 K. If the initial concentrations of A and B are both 1.0 M, what will be the equilibrium concentration of each gas at 298 K? The equilibrium constant (Kc) for the reaction at 298 K is 2.75 x 10^-2.

asked Feb 4 in Physical Chemistry by Lettie458244 (1.9k points)

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1 answer 24 views

How can benzyl chloride and ammonia be reacted to synthesize phenylalanine, and what are the specific conditions (such as temperature and pressure) required for this reaction to occur?

asked Feb 4 in Chemical synthesis by SherrylP401 (2.4k points)

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1 answer 29 views

Design a system for the safe storage and transportation of highly concentrated sulfuric acid, considering factors such as material compatibility, environmental impact, and spill prevention.

asked Feb 4 in Chemical engineering by Milagros70T7 (1.5k points)

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1 answer 29 views

Design a synthetic route to prepare (Z)-4-octene from 1-octyne using any suitable reagents and reaction conditions, while achieving a high yield and selectivity for the desired (Z)-isomer.

asked Feb 4 in Organic Chemistry by NadiaN491716 (2.1k points)

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1 answer 65 views

Describe the mechanism of Heterogeneous Catalysis taking place in the Haber process for ammonia synthesis and explain the role of the catalyst in the reaction.

asked Feb 3 in Surface Chemistry by SZVRamon1645 (2.4k points)

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1 answer 67 views

Calculate the standard molar entropy change (∆S°) at 298 K for the reaction: 2H2 (g) + O2 (g) → 2H2O (l) given that the standard molar enthalpy change (∆H°) for this reaction is -572 kJ/mol.

asked Feb 3 in Quantum Chemistry by MaryellenGra (2.1k points)

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0 answers 27 views

How can molecular docking studies be used to discover new drugs for a specific target protein, and what factors need to be considered in order to ensure drug efficacy and specificity?

asked Feb 5 in Computational Chemistry by DelorasGaise (1.9k points)

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1 answer 29 views

Design a retrosynthesis for the synthesis of 2-phenylpropionic acid from benzene, ethylene, and CO₂.

asked Feb 4 in Organic Chemistry by CheryleKirso (2.1k points)

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Design a distillation column to separate a mixture of acetone and water containing 35% (by mole) acetone with a feed rate of 1000 kg/hr. The desired purity of the overhead product is 99% acetone, and the bottom product should contain no more than 0.5% acetone. The available reflux ratio is 2.5, and the feed is at its boiling point at normal atmospheric pressure. Determine the number of theoretical trays required, the optimum feed tray location, and the reflux and boilup rates needed for the design.

asked Feb 4 in Chemical engineering by IsabelleTitu (1.8k points)

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1 answer 64 views

Design a chemical reactor system for the production of 500 kg/hr of methanol (CH3OH) through the reaction of carbon monoxide (CO) and hydrogen gas (H2). The reactor should operate at a pressure of 100 atm and a temperature of 300°C, and must achieve a minimum conversion rate of 80%. Determine the type of reactor needed and its dimensions, as well as the required flow rates of CO and H2 gas to meet the production target.

asked Feb 3 in Chemical engineering by KelleS495456 (1.9k points)

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1 answer 66 views

Calculate the ΔHrxn for the combustion of methane gas (CH4) if the enthalpies of formation for methane, carbon dioxide, and water are -74.8, -393.5, and -285.8 kJ/mol respectively, using Hess's Law.

asked Feb 3 in Chemical reactions by ArlenBieber1 (1.9k points)

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1 answer 63 views

Design a distillation column that separates a mixture of ethanol and water with a 95% ethanol purity and a production rate of 1000 liters per hour. The mixture contains 50% ethanol and 50% water by volume. The distillation column should operate at a pressure of 1 atm and a temperature range of 78-85°C. Assume that the feed enters the column as a saturated liquid and that the overhead product is 90% ethanol, while the bottom product is 5% ethanol. Determine the number of stages required and the reflux ratio for this system.

asked Feb 3 in Chemical engineering by JonasOql0066 (1.5k points)

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1 answer 66 views

Calculate the total heat change when 100 ml of 0.5 M HCl is mixed with 100 ml of 0.5 M NaOH at 25°C. Assume the heat capacity of the solution is 4.18 J/(g°C) and the density of the solution is 1 g/mL. The enthalpy of neutralization of HCl and NaOH is -57.3 kJ/mol.

asked Feb 3 in ThermoChemistry by ChasityLearm (2.1k points)

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1 answer 28 views

Design a retrosynthesis plan to synthesize ibuprofen from benzene.

asked Feb 4 in Organic Chemistry by SusannahCrow (2.4k points)

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1 answer 63 views

Design a chemical reactor to produce 500 kg of ethylene oxide per hour from ethylene and oxygen gases. Assume the reaction occurs isothermally, and the reactor operates at 3 atm and 250°C. The conversion of ethylene to ethylene oxide is 90%, and the selectivity of ethylene oxide is 97%. You can use either a plug-flow reactor or a continuous stirred-tank reactor. Determine the volume and dimensions of the reactor, and also its cost, assuming a stainless steel construction.

asked Feb 3 in Chemical engineering by JoesphWoffor (2.3k points)

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1 answer 44 views

Design a polymer-based sensor that can detect the presence of heavy metals in water and suggest a mechanism for its working.

asked Feb 4 in Polymer Chemistry by HalleySomers (1.8k points)

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1 answer 80 views

How does changing the reaction stoichiometry affect the rate of a chemical reaction between hydrogen peroxide and potassium iodide?

asked Feb 3 in Chemical kinetics by Annett65L392 (2.1k points)

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