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A student is asked to design a distillation column for the separation of a mixture consisting of ethanol and water. The student has to determine the number of theoretical plates required for the column to achieve a product concentration of 95% ethanol, given the feed mixture contains 25% ethanol and 75% water. The student also needs to calculate the amount of steam required for the reboiler to operate at a reflux ratio of 3.5, assuming the total condenser efficiency is 100%.

asked Jan 22 in Chemical engineering by JonasQuj2910 (2.1k points)

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1 answer 83 views

A student has a solution of AlF3 with a concentration of [AlF3] = 0.015 M, which is in equilibrium according to the equation: AlF3 (s) ⇌ Al3+ (aq) + 3 F- (aq). Calculate the new equilibrium concentration of F- ions if 0.001 mol of NaF is added to the solution initially at equilibrium. (Ksp of AlF3 = 2.0 x 10^-23, NaF is a common ion with F-)

asked Jan 22 in Chemical equilibrium by DeboraFallen (2.1k points)

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1 answer 132 views

A student has a solution of acetic acid (CH3COOH) with a concentration of 0.1 M and wants to calculate the effect of adding sodium acetate (NaCH3COO) with a concentration of 0.05 M on the equilibrium position of the reaction CH3COOH + H2O ↔ CH3COO- + H3O+. Calculate the new equilibrium concentrations of all species and explain the effect of the added common ion on the equilibrium position.

asked Jan 22 in Chemical equilibrium by GabrielCantu (1.6k points)

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1 answer 113 views

A student has a sample of an unknown inorganic compound that contains only carbon, oxygen, and nitrogen. They perform a combustion analysis on a 0.230 g sample of the compound, which yields 0.535 g of CO2 and 0.184 g of H2O. Additionally, when the compound is analyzed using a mass spectrometer, the mass spectrum shows a molecular ion peak at m/z = 42. Determine the empirical and molecular formulas of this compound.

asked Jan 22 in Inorganic Chemistry by JaneW5862561 (1.8k points)

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1 answer 82 views

A student has 5 grams of sulfur and 8 grams of oxygen. When the two are reacted to form sulfur dioxide, which one is the limiting reactant, and how much sulfur dioxide can be produced?

asked Jan 22 in Chemical reactions by ChasityLearm (2.1k points)

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1 answer 147 views

A student has 20 grams of iron and 40 grams of oxygen. What is the limiting reactant in the reaction between iron and oxygen to form iron oxide (FeO)? How many grams of FeO can be produced assuming complete reaction and no excess reactants?

asked Jan 22 in Chemical reactions by CandelariaFe (1.6k points)

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1 answer 93 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 KyleSchlemme (2.1k points)

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1 answer 141 views

A student conducted an experiment to produce copper sulfate using a known amount of copper oxide and sulfuric acid. The expected yield was 30 grams of copper sulfate, but the student obtained only 25 grams. What is the percent yield of the reaction?

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

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1 answer 135 views

A student conducted an experiment to calculate the Faraday constant using a silver-copper voltaic cell. The masses of the copper and silver electrodes were 4.023g and 4.721g respectively. The cell was run for 782 seconds at a constant current of 0.250A. Calculate the value of the Faraday constant for this experiment.

asked Jan 22 in ElectroChemistry by Jaqueline50I (2.0k points)

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1 answer 125 views

A student conducted an electrolysis experiment using a current of 2 amperes for 30 minutes with a copper sulfate solution. What is the mass of copper deposited on the cathode? The atomic weight of copper is 63.546 g/mol and the Faraday constant is 96,485 C/mol.

asked Jan 22 in ElectroChemistry by TawnyaI60415 (1.4k points)

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1 answer 89 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 HildredU3922 (1.9k points)

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1 answer 49 views

A student carried out a chemical reaction in the laboratory and obtained 12 grams of the product. However, the theoretical yield of the product was 15 grams. Calculate the percent yield of the product.

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

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1 answer 47 views

A student attempted to synthesize 20 grams of a compound, but only ended up with 15 grams of the compound after the reaction. Calculate the percentage yield of the reaction.

asked Jan 22 in Chemical reactions by GraceChaves1 (2.0k points)

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1 answer 46 views

A student attempted to produce 25 grams of product by performing a chemical reaction, but only obtained 18 grams. What was the percent yield for this reaction?

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

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1 answer 114 views

A student adds 0.1 M HCl to a solution containing 0.05 M NaOH. Calculate the effect on the equilibrium position of the system after adding a buffer solution consisting of 0.1 M CH3COOH and 0.1 M CH3COONa. Assume the dissociation constant (Ka) of CH3COOH is 1.8x10^-5.

asked Jan 22 in Chemical equilibrium by GroverRamey (2.2k points)

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1 answer 45 views

A steel pipeline is being used to transport a chemical mixture containing sulfuric acid. Given the concentration of sulfuric acid in the mixture and the surface area of the pipeline, calculate the corrosion rate of the steel pipeline in millimeters per year. Show your calculation and explain the significance of the result.

asked Jan 22 in ElectroChemistry by HenryBorella (2.2k points)

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1 answer 70 views

A steel pipe is in contact with a copper pipe in a galvanic couple, with the steel pipe acting as the anode. The corrosion current density of the steel pipe in the couple is 0.008 mA/cm². Determine the rate of corrosion of the steel pipe, assuming that the density of steel is 7.8 g/cm³ and the thickness of the pipe is 2.5 mm. Also, calculate the time taken for the pipe to corrode completely, assuming an initial mass of 5 kg.

asked Jan 22 in ElectroChemistry by Agustin3989 (1.7k points)

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1 answer 74 views

A steel pipe is connected to a copper pipe in a galvanic corrosion couple where the electrolyte is seawater. The corrosion current density of the steel pipe is 3.2 mA/cm2. If the surface area of the steel pipe is 5 cm2, calculate the total amount of charge transferred per hour. Also, calculate the weight loss of the steel pipe per year due to galvanic corrosion, assuming the density of steel is 7.85 g/cm3.

asked Jan 22 in ElectroChemistry by Aline0805519 (1.8k points)

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1 answer 90 views

A solution of nitrogen dioxide, NO2 gas, at a pressure of 2.50 atm and temperature of 300 K, reacts with oxygen gas, O2, to form nitrogen oxide, NO, and dioxide, NO2. Write the balanced chemical equation for the reaction and determine the equilibrium concentrations of all species if the value of the equilibrium constant, Kc, at 300 K is 4.0 x 10^-4.

asked Jan 22 in Chemical equilibrium by Samira94683 (2.2k points)

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1 answer 140 views

A solution of NaCl was electrolyzed using a current of 2.0 A for 30 minutes. If 0.20 grams of NaCl was consumed in the process, what is the value of the Faraday constant?

asked Jan 22 in ElectroChemistry by FelixTolmer3 (1.9k points)

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