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A chemistry student needs to determine the percentage of iron (Fe) present in a given iron ore sample using gravimetric analysis. The student is provided with the mass of the iron ore sample and a standardized solution of potassium dichromate (K2Cr2O7) to use for the analysis. What is the percentage of iron (Fe) in the given iron ore sample?

asked Jan 22 in Analytical Chemistry by ElyseY075419 (2.7k points)

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1 answer 38 views

Calculate the corrosion potential of a silver metal in a solution containing 0.1 M silver nitrate and 1 M nitric acid given that the standard reduction potential of the Ag⁺/Ag couple is +0.80 V and the standard reduction potential of the NO₃⁻/NO₂⁻ couple is +0.96 V.

asked Jan 23 in ElectroChemistry by OfeliaDelmon (2.3k points)

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A beaker containing 1L of water is divided into two equal compartments by a semi-permeable membrane. One side of the membrane has 1M NaCl solution and the other side is pure water. Determine the time taken for the concentration of NaCl on both sides of the membrane to become equal through diffusion. Given: Molecular weight of NaCl is 58.44 g/mol, and diffusion coefficient of NaCl in water is 1.6 x 10^-9 m^2/s.

asked Jan 22 in Physical Chemistry by Ina75H680861 (3.2k points)

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1 answer 79 views

A chemistry student must calculate the boiling point of a solution composed of 10 g of glucose (C6H12O6) dissolved in 100 g of water at 1 atm pressure. The boiling point elevation constant for water (Kb) is equal to 0.512°C/m, and the normal boiling point of pure water is 100°C.

asked Jan 22 in Physical Chemistry by HesterLoyau3 (2.3k points)

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1 answer 80 views

A chemical plant needs to separate a mixture of benzene and toluene using a distillation column. The feed contains 40% benzene and 60% toluene. Design a distillation column to achieve a distillate with at least 90% purity of benzene. Provide the reflux ratio and the number of theoretical trays required to meet the purity specification. Assume an operating pressure of 1 atm and th

asked Jan 22 in Chemical engineering by AntonioDaven (2.4k points)

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A chemistry student is provided with two coordination compounds - [Co(NH3)4Cl2] and [Co(NH3)5Cl] - and is asked to identify the type(s) of isomerism exhibited by these compounds. Can you determine the type(s) of isomerism present in each compound and explain how they are different from each other?

asked Jan 22 in Coordination Chemistry by YaniraRhh59 (2.5k points)

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1 answer 40 views

Calculate the band gap and optical absorption spectrum of a graphene monolayer using quantum chemical calculations and compare it with that of a MoS2 monolayer. Which material would be more suitable for optoelectronic devices? Explain your reasoning.

asked Jan 23 in Quantum Chemistry by 092347908024 (2.5k points)

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1 answer 67 views

A student wants to determine the amount of chloride ions present in a sample of seawater. Using potentiometry, what is the concentration of chloride ions present in the sample?

asked Jan 22 in Analytical Chemistry by CorneliusChi (2.6k points)

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1 answer 67 views

A student wants to calculate the reaction quotient, Q, for the following chemical reaction at 298 K:2H2(g) + O2(g) ⇌ 2H2O(g)If the partial pressures of H2, O2, and H2O are 0.25 atm, 0.15 atm, and 0.1 atm, respectively, what is the value of Q?

asked Jan 22 in Chemical thermodynamics by BrentAshcrof (2.0k points)

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1 answer 71 views

A student formed 25 grams of carbon dioxide through a chemical reaction. If the theoretical yield of carbon dioxide is 30 grams, what is the percent yield of the reaction?

asked Jan 22 in Chemical reactions by LatashaWillc (2.4k points)

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1 answer 70 views

A student needs to calculate the heat of mixing for a 50 mL solution containing 0.1 M HCl and 0.1 M NaOH. The temperature of the solution is 25°C and the density is 1 g/mL. The enthalpy of neutralization for HCl and NaOH is -57.3 kJ/mol. Determine the heat of mixing for the solution.

asked Jan 22 in ThermoChemistry by GarnetFjo447 (2.5k points)

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1 answer 73 views

A container has a mixture of nitrogen and oxygen gases at equilibrium. If the temperature of the container is increased, predict the direction in which the equilibrium will shift according to Le Chatelier's principle and explain why.

asked Jan 22 in Chemical reactions by AlfredLamb10 (2.2k points)

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1 answer 78 views

A chemistry student needs to calculate the standard enthalpy change for the combustion reaction of methane gas (CH4) at 298 K and 1 atm pressure. The equation for the reaction is:CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l)Given the following standard enthalpies of formation at 298 K:ΔHf(CO2) = -393.5 kJ/molΔHf(H2O) = -285.8 kJ/molΔHf(CH4) = -74.8 kJ/molCalculate ΔHrxn, the standard enthalpy change for the combustion reaction of methane gas.

asked Jan 22 in Chemical thermodynamics by ZaraEnderby5 (2.3k points)

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1 answer 72 views

A sample of 55.0 g of ethanol at 25°C is vaporized at its normal boiling point. The enthalpy of vaporization for ethanol is 38.56 kJ/mol. Calculate the amount of heat energy required for this process.

asked Jan 22 in ThermoChemistry by Mose2866156 (2.4k points)

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1 answer 78 views

A chemistry student needs to calculate the new value of the ionization constant (Ka) of a weak acid when the temperature is raised from 25°C to 45°C, given that the initial value of Ka is 1.8 x 10^-5 at 25°C and the enthalpy of ionization (ΔHion) is 50.2 kJ/mol.

asked Jan 22 in Chemical equilibrium by ChiKellett4 (2.0k points)

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1 answer 84 views

A 25 g sample of water at 25°C is heated by 200 J. The temperature of the water increases to 40°C. Calculate the specific heat capacity of water.

asked Jan 22 in Chemical thermodynamics by LuzGerste41 (2.4k points)

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1 answer 66 views

A student wants to determine the concentration of silver ions (Ag+) in a solution. Using an Ag/Ag+ reference electrode, the student measures the cell potential to be +0.56 V when the solution is electrolyzed for 25 minutes at a constant current of 0.50 A. The volume of the solution is 150 mL. What is the concentration of silver ions in the solution in mol/L?

asked Jan 22 in ElectroChemistry by ChiKellett4 (2.0k points)

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1 answer 70 views

A student conducted an electrochemical reaction using a copper electrode to reduce a solution containing Ag+ ions. The standard reduction potential for Ag+ is 0.80 V and the standard reduction potential for Cu2+ is 0.34 V. The student measured the cell potential to be 0.62 V. Calculate the overpotential of the reaction and determine if the reduction of Ag+ occurs spontaneously.

asked Jan 22 in ElectroChemistry by REHJon915716 (1.8k points)

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1 answer 81 views

A 50.0 g sample of ethanol is heated from 25.0 °C to 85.0 °C, and absorbs 237 J of heat. What is the specific heat capacity of ethanol?

asked Jan 22 in ThermoChemistry by DeanneMack98 (1.9k points)

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1 answer 69 views

A student needs to calculate the Faraday constant for the reduction of copper ions in a solution using a current of 2.5 amperes for 5 minutes. If the mass of copper deposited on the cathode was 0.3 grams, what is the value of the Faraday constant?

asked Jan 22 in ElectroChemistry by MaynardErb58 (2.1k points)

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