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A chemical engineering company has a mixture of ethanol and water with a concentration of 30% ethanol to separate using a distillation column. The company needs to obtain a concentration of 80% ethanol in the distillate at a reflux ratio of 3. Calculate the number of theoretical plates required in the column for the separation, assuming no vapor or liquid bypass, and that the minimum vapor velocity is maintained.

asked Jan 22 in Chemical engineering by SvenJonathan (1.9k points)

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1 answer 81 views

A chemistry student needs to determine the effect of adding more reactant or product on the equilibrium position of the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)If the student adds more N2 or NH3 to the reaction mixture, how will the equilibrium position change? and how will the equilibrium constant (Kc) for the reaction be affected?

asked Jan 22 in Chemical equilibrium by JeanetteOffi (1.7k points)

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1 answer 73 views

A student needs to calculate the Tafel slopes for the anodic and cathodic reactions from a given set of experimental data obtained during an electrochemical experiment. The experiment involves the corrosion of iron in a solution with a pH of 3.5. The anodic and cathodic current densities were measured at various applied potentials ranging from -700 mV vs SHE to -400 mV vs SHE. The student needs to plot a Tafel plot for each reaction and calculate their corresponding Tafel slopes. Based on the obtained results, the student needs to explain the corrosion mechanism of iron in the given acidic solution.

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

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1 answer 82 views

A chemistry student is given a sample of an unknown salt consisting of a mixture of two compounds. The student is asked to determine the percentage composition of each compound in the salt using mass balance calculations. The total mass of the sample is 10 grams, and after performing careful analysis, the student obtains the following data: One compound has a molar mass of 80 g/mol and comprises 60% of the total mass of the salt. The other compound has a molar mass of 120 g/mol and comprises 40% of the total mass of the salt. What are the percentage compositions of each compound in the salt?

asked Jan 22 in Analytical Chemistry by RosieBloom03 (1.8k points)

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1 answer 113 views

Balance the following chemical equation for the combustion of methane (CH4) in oxygen (O2) to form carbon dioxide (CO2) and water (H2O): CH4 + O2 → CO2 + H2O

asked Jan 21 in Inorganic Chemistry by Estella80D9 (2.2k points)

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1 answer 70 views

A student performs a chemical reaction between 12.5 grams of magnesium and 15.0 grams of hydrochloric acid to produce magnesium chloride and hydrogen gas. If the theoretical yield of magnesium chloride is 25.7 grams, calculate the percent yield of the reaction.

asked Jan 22 in Chemical reactions by Cameron54A25 (1.9k points)

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1 answer 69 views

A student wants to know the equilibrium concentration of hydrogen gas and nitrogen gas at a particular temperature and pressure when they are mixed in a container in a 2:1 ratio. The student also wants to calculate the equilibrium constant of the reaction when nitrogen and hydrogen form ammonia. Can you help the student by designing a step-by-step procedure to find the equilibrium concentrations and equilibrium constant at the given conditions?

asked Jan 22 in Physical Chemistry by TaneshaDoss0 (1.9k points)

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1 answer 73 views

A student is given the electrochemical cell reaction:MnO4-(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)Calculate the standard potential (in volts) of the cell at 25°C given that the standard reduction potential of MnO4-(aq)/Mn2+(aq) couple and the standard reduction potential of the H+(aq)/H2(g) couple are +1.51 V and 0.00 V, respectively. The concentration of MnO4-(aq) is 0.010 M and that of H+(aq) is 1.00 M.

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

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1 answer 73 views

A student is given a galvanic cell consisting of a zinc electrode and a copper electrode. If the concentration of zinc ions in the zinc half-cell is 0.1 M and the concentration of copper ions in the copper half-cell is 1.0 M, what is the corrosion potential of the zinc electrode at standard conditions? (Assume that the standard electrode potential of copper is +0.34 V and that of zinc is -0.76 V.)

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

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1 answer 69 views

A student wants to determine the mass of silver (Ag) that will be deposited on the cathode when a current of 4 A passes through a solution of silver nitrate (AgNO3) for 30 minutes. What is the mass of silver that will be deposited on the cathode? (Assume a Faraday constant of 96,485 C/mol and the atomic mass of silver is 107.87 g/mol).

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

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1 answer 44 views

Based on the knowledge of biochemistry pertaining to Glycolysis and gluconeogenesis, here's a question for a chemistry student to solve:What are the differences and similarities between glycolysis and gluconeogenesis? Compare and contrast the different pathways, enzymes involved, and energetics of these two important biochemical processes. Provide specific examples to support your answer.

asked Jan 23 in BioChemistry by Ben56061281 (1.4k points)

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1 answer 69 views

A student synthesized two coordination compounds containing the same metal ion, ligands, and donor atoms. However, the student found that the two compounds exhibited different physical and chemical properties. Explain the possible types of isomerism that could exist in these coordination compounds and how they can be distinguished.

asked Jan 22 in Coordination Chemistry by EllisDonahue (2.6k points)

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1 answer 81 views

A chemistry student is given a 10 mL sample of a solution containing chloride ions and sulfate ions, and is asked to determine the mass of each ion present in the sample. The student knows that the total mass of the solution is 12.25 g, and that the density of the solution is 1.225 g/mL. The student also knows that the mass percent of chloride ions in the solution is 5%, and the mass percent of sulfate ions is 10%. Using mass balance calculations, what is the mass of chloride ions and sulfate ions present in the sample?

asked Jan 22 in Analytical Chemistry by KaiRazo33412 (1.9k points)

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1 answer 69 views

A student performed an experiment to synthesize aspirin using 5 grams of salicylic acid and an excess of acetic anhydride. After the reaction was completed, the student collected 4.2 grams of aspirin. What is the percent yield of this experiment?

asked Jan 22 in Chemical reactions by SteveAdamson (1.7k points)

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1 answer 80 views

A chemistry student needs to calculate the rate constant (k) for the following first-order reaction based on the given data: The half-life of the reaction is 20 seconds when the initial concentration of reactant is 0.2M. What is the rate constant of the reaction?

asked Jan 22 in Chemical kinetics by Lettie458244 (1.9k points)

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1 answer 79 views

A chemistry student needs to determine the effect of increasing the pressure on the equilibrium position of a reaction. Consider the following reaction at equilibrium: N2(g) + 3H2(g) ⇌ 2NH3(g) If the pressure is increased, will the reaction shift to the left or right, and in what direction will the reaction quotient, Q, shift as a result? Justify your answer using Le Chatelier's principle.

asked Jan 22 in Chemical equilibrium by Hugo83583981 (1.5k points)

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1 answer 38 views

Calculate the effect of adding a buffer solution consisting of equal amounts of acetic acid (pKa = 4.76) and sodium acetate to a 0.1 M solution of acetic acid (Ka = 1.8 x 10^-5) at equilibrium. The volume of the buffer added is equal to the volume of the acetic acid solution.

asked Jan 23 in Chemical equilibrium by DeneseSteinm (1.9k points)

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1 answer 71 views

A student needs to calculate the efficiency of an electrochemical cell that has a potential difference of 1.5 volts and a current of 0.5 amperes passing through it, with the help of Faraday's Law. If the electrode reaction produces chlorine gas with a Faraday efficiency of 79%, and the overall voltage efficiency of the cell is 85%, what is the efficiency of the electrochemical cell?

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

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1 answer 66 views

Balance the chemical equation for the combustion of propane (C3H8) in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water (H2O).

asked Jan 22 in Chemical reactions by Vance58E9387 (1.9k points)

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1 answer 67 views

A student wants to maximize the production of ammonia from nitrogen and hydrogen gases using the Haber process. Using Le Chatelier's principle, how can the reaction conditions be adjusted to increase the yield of ammonia? Specifically, how can changes in temperature, pressure, and concentration of reactants be used to increase the equilibrium concentration of ammonia?

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

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