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Calculate the standard electrode potential of a silver electrode (Ag) in contact with a solution containing 1.0 M AgNO3 and a hydrogen electrode (Pt) in contact with a solution containing 1.0 M HCl, given that the reduction potential of Ag+/Ag is +0.80V and the reduction potential of H+/H2 is 0.00V at 298K.

asked Feb 3 in ElectroChemistry by JoeannKeaton (370 points)

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1 answer 38 views

Design a heat exchanger for a process where hot air (80°C) needs to be cooled down to 30°C using water (10°C) as the cooling medium. The flow rate of hot air is 2 kg/s and the desired outlet temperature of the cooled air is 35°C. The maximum allowable pressure drop for air side is 50 kPa and for water side is 100 kPa. Design the heat exchanger using the LMTD (logarithmic mean temperature difference) method and calculate the required area of heat transfer.

asked Feb 4 in Chemical engineering by SherlynSprig (590 points)

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1 answer 56 views

Design a cost-effective and environmentally sustainable process for the production of biofuels from lignocellulosic materials, integrating pre-treatment, enzymatic hydrolysis and fermentation steps, while optimizing yield, energy efficiency, and minimizing waste generation.

asked Feb 3 in Chemical engineering by WGZMargarett (430 points)

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1 answer 62 views

Calculate the standard enthalpy change for the fusion reaction of 50g of ice at 0°C with 450g of liquid water at 25°C. The molar enthalpy of fusion of ice is 6.01 kJ/mol and the specific heat capacity of water is 4.18 J/g·°C. Assume there are no heat losses to the surroundings.

asked Feb 3 in Chemical thermodynamics by TeresitaVerc (530 points)

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1 answer 36 views

Design a polymer-based smart material that changes color when exposed to a specific chemical or environmental stimulus. How would you choose the appropriate polymer and chemical to achieve this objective? What factors would you consider in optimizing the material's response time and sensitivity?

asked Feb 4 in Polymer Chemistry by BrandenBreez (360 points)

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1 answer 9 views

How can chemistry students be given more exposure to current research in the field, and what impact would such exposure have on their understanding and motivation to pursue a career in chemistry research?

asked Feb 4 in Chemical education by BethanySheld (590 points)

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1 answer 53 views

Design a distillation column for the separation of a binary mixture consisting of ethanol and water. The feed mixture contains 40 mol% ethanol and 60 mol% water, and the desired product purity is 95 mol% ethanol. The feed rate is 1000 kg/hr and the column should operate at atmospheric pressure. Calculate the number of theoretical plates required to achieve the desired separation and determine the corresponding height and diameter of the column.

asked Feb 3 in Chemical engineering by BAHLorenza82 (290 points)

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1 answer 9 views

How can chemistry students address the issue of insufficient funding for chemistry education in their schools and communities?

asked Feb 4 in Chemical education by EleanoreWitc (370 points)

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1 answer 35 views

Design a distillation column to separate a mixture of cyclohexane and toluene with a feed composition of 60 mol% cyclohexane and 40 mol% toluene. The distillate product should contain a minimum of 90 mol% cyclohexane and the bottom product should contain a maximum of 10 mol% cyclohexane. You have access to a temperature range of 80-150°C and a pressure range of 1-5 atm. Determine the number of theoretical plates required for this separation and the corresponding reflux ratio.

asked Feb 4 in Chemical engineering by HumbertoA803 (670 points)

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1 answer 55 views

Can the use of ceramic materials with specific structural properties enhance the performance and durability of gas turbine engines operating at high temperatures?

asked Feb 3 in Materials Chemistry by Jerrold82500 (350 points)

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1 answer 56 views

Calculate the standard enthalpy of formation of methane (CH4) given the following enthalpy data: C(graphite) + 2H2(g) → CH4(g) ΔH° = -74.8 kJ/mol ΔH°f[C(graphite)] = 0 kJ/molΔH°f[H2(g)] = 0 kJ/mol (Hint: Use Hess's Law and the fact that the standard enthalpy of formation of an element in its most stable state is zero.)

asked Feb 3 in ThermoChemistry by RobbiePartee (650 points)

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1 answer 5 views

How can chemistry students overcome the challenge of limited access to laboratory equipment and facilities?

asked Feb 5 in Chemical education by AdaWeddle050 (310 points)

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1 answer 5 views

How can chemistry students obtain relevant and practical experience to adequately prepare for chemistry-related careers?

asked Feb 5 in Chemical education by DarnellSauls (350 points)

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1 answer 9 views

How can chemistry educators improve the emphasis on safety protocols in chemistry labs to ensure that students are better prepared for chemical hazards that can occur during experiments and research?

asked Feb 4 in Chemical education by DarrellRabin (370 points)

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1 answer 7 views

How can chemistry students be exposed to current research in their field, particularly in topics or subfields that may not be covered in their coursework or textbooks?

asked Feb 4 in Chemical education by AshelyMullah (510 points)

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1 answer 7 views

How can chemistry students be better prepared for chemistry-related careers to effectively apply their education and skills to real-world situations?

asked Feb 4 in Chemical education by KatjaSilverm (270 points)

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1 answer 52 views

Consider the reaction: Cu^2+ + 4NH3 ⇌ [Cu(NH3)4]^2+ If the initial concentration of Cu^2+ is 0.5 M and the initial concentration of NH3 is 2 M, what is the concentration of [Cu(NH3)4]^2+ at equilibrium if the concentration of NH3 is increased to 5 M? (Assume the volume of the solution remains constant and the temperature is kept constant.)

asked Feb 3 in Chemical equilibrium by ErnestineRed (450 points)

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1 answer 32 views

Design a heat exchanger that can effectively transfer heat between a hot stream of ethanol with a flow rate of 2 kg/s and a cold stream of water with a flow rate of 5 kg/s. The inlet temperature of ethanol is 80°C, while the inlet temperature of water is 20°C. The outlet temperature of ethanol should be 30°C, while the outlet temperature of water should not exceed 35°C. The heat exchanger should have a heat transfer coefficient of at least 500 W/m^2K and a total surface area of no more than 10 m^2.

asked Feb 4 in Chemical engineering by TaraFreeleag (290 points)

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1 answer 10 views

How can a cost-effective and efficient system be designed to extract valuable metals like gold and silver from electronic waste, while minimizing environmental impact and complying with regulatory standards?

asked Feb 4 in Chemical engineering by AugustinaLjy (350 points)

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1 answer 10 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 DeboraI27521 (330 points)

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