Recent questions in Chemistry

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A student wants to find the enthalpy change of a chemical reaction using Hess's Law, but the only information provided is the enthalpy change of two other reactions. Design an experiment to determine the enthalpy change of the unknown reaction using the given data and Hess's Law.

asked Jan 22 in Chemical reactions by EricaNeumann (770 points)

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1 answer 72 views

A student wants to find out the cell potential of a voltaic cell made up of a nickel electrode and an iron electrode. The nickel electrode is in a 0.1 M nickel (II) sulfate solution, and the iron electrode is in a 0.1 M iron (II) sulfate solution. What is the cell potential of this voltaic cell at standard conditions (25°C and 1 atm of pressure) given the standard reduction potentials for Ni2+/Ni and Fe2+/Fe are -0.25 V and -0.44 V, respectively?

asked Jan 22 in ElectroChemistry by LillyZpi8210 (490 points)

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1 answer 60 views

A student wants to electroplate a piece of copper with silver in an electrochemical cell. If a current of 0.5 A is passed through the cell for 30 minutes, what mass of silver will be deposited on the copper piece? The atomic mass of silver is 107.87 g/mol and the faraday constant is 96,485 C/mol.

asked Jan 22 in ElectroChemistry by AsaCarlino59 (430 points)

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1 answer 11 views

A student wants to electroplate a nickel wire with copper. The student has 1 g of copper sulfate and a 2 M solution of sulfuric acid. The wire has a surface area of 3 cm², and the desired copper thickness on the wire is 0.025 cm. How long should the student electroplate the wire with a current of 1.5 A to achieve the desired thickness of copper? Calculate the current density in the electrochemical cell.

asked Jan 22 in ElectroChemistry by ElenaElrod34 (430 points)

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1 answer 11 views

A student wants to determine the specific surface area of a solid sample using gas adsorption. The sample has a mass of 1 gram and the adsorption isotherm follows the BET model. The student measures the volume of nitrogen gas adsorbed at different pressures and obtains the following data:Pressure (torr) | Volume of nitrogen (cm3)---------------|----------------------- 50 | 24.51 100 | 39.22 200 | 67.38 300 | 90.86 400 | 104.29What is the specific surface area of the sample based on the BET model?

asked Jan 22 in Surface Chemistry by JulianeToups (210 points)

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1 answer 51 views

A student wants to determine the rate law for the reaction between compound A and compound B. The student measures the initial rate of the reaction under different conditions and records the following data:| Experiment | [A] (M) | [B] (M) | Initial Rate (M/s) ||------------|---------|---------|-------------------|| 1 | 0.1 | 0.1 | 4.22x10^-4 || 2 | 0.2 | 0.1 | 8.44x10^-4 || 3 | 0.1 | 0.2 | 1.69x10^-3 |What is the rate law expression for this reaction in terms of the rate constant, k?

asked Jan 22 in Chemical kinetics by SamiraY20394 (310 points)

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1 answer 54 views

A student wants to determine the rate constant of a first-order reaction. The initial concentration of reactant is 0.050 M and after 60 seconds, the concentration drops to 0.025 M. What is the rate constant of the reaction?

asked Jan 22 in Chemical kinetics by MickiWedgwoo (390 points)

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1 answer 54 views

A student wants to determine the rate constant for the reaction between hydrogen and iodine gases, given the following experimental data:-At t=0, the initial concentration of hydrogen is 0.025 M and iodine is 0.015 M.-10 seconds later, the concentration of hydrogen is 0.018 M and iodine is 0.022 M.-The reaction is second-order with respect to hydrogen, and first-order with respect to iodine.What is the rate constant for the reaction?

asked Jan 22 in Chemical kinetics by CorineHumble (250 points)

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1 answer 61 views

A student wants to determine the power output of a galvanic cell containing a zinc electrode and a copper electrode. The zinc electrode has a surface area of 20 cm² and is coated with a layer of zinc which weighs 0.5 grams. The copper electrode has a surface area of 15 cm² and is coated with a layer of copper that weighs 0.4 grams. The cell operates at standard conditions (25°C and 1 atm), and the electrolyte is a solution of 1 M copper sulfate and 1 M zinc sulfate. Calculate the power output of the electrochemical cell.

asked Jan 22 in ElectroChemistry by KarenPontiff (530 points)

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1 answer 44 views

A student wants to determine the polarization in an electrochemical cell where the anode is made of zinc and the cathode is made of copper. The electrolyte used is CuSO4. The current through the cell is 0.5 A and the measured potential difference is 1.5 V. What is the polarization of this electrochemical cell?

asked Jan 22 in ElectroChemistry by TheodoreBock (330 points)

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1 answer 39 views

A student wants to determine the maximum voltage and power output of a primary cell that consists of a zinc electrode in 1M Zn(NO3)2 solution and a silver electrode in 1M AgNO3 solution. The student knows the standard reduction potentials of Zn2+/Zn and Ag+/Ag to be -0.76V and +0.80V, respectively. Assuming the cell operates under standard conditions at 298K, what is the maximum voltage that the cell can generate and the maximum power output it can deliver?

asked Jan 22 in ElectroChemistry by JosetteVeneg (240 points)

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1 answer 67 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 ChelseyPalme (210 points)

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1 answer 50 views

A student wants to determine the ionization constant of a weak acid. They use the initial concentration and the pH of the solution at a given temperature to calculate the ionization constant. Given that the temperature of the solution is changed by 10°C, how will this affect the ionization constant of the weak acid? Calculate the new ionization constant at the new temperature assuming that no additional acid or base is added to the solution.

asked Jan 22 in Chemical equilibrium by KennethBleds (350 points)

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1 answer 59 views

A student wants to determine the enthalpy of combustion of octane. They measured the temperature change of 200 mL of water in a calorimeter when 1.50 grams of octane was burned completely. The initial temperature of the water was 25.0 °C and it reached a maximum of 45.0 °C. What is the enthalpy of combustion of octane?

asked Jan 22 in ThermoChemistry by Emily9252148 (310 points)

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1 answer 65 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 SiennaKoontz (450 points)

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1 answer 66 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 EsmeraldaFre (290 points)

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1 answer 50 views

A student wants to calculate the standard cell potential for a galvanic cell that consists of a silver electrode and a copper electrode. The silver electrode has a silver ion concentration of 0.05 M and the copper electrode has a copper ion concentration of 0.1 M. What is the standard cell potential for this cell?

asked Jan 22 in Physical Chemistry by Debra355756 (170 points)

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1 answer 66 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 EssieFinn62 (330 points)

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1 answer 9 views

A student wants to calculate the rate of an electrochemical reaction. They know that the concentration of the anodic reactant is 0.01 M and that the cathodic reactant is at a concentration of 0.02 M. The student also knows that the cell potential is 1.23 V, and that the Faraday's constant is 96485 C/mol. The reaction is:Fe(s) + Cu2+(aq) → Fe2+(aq) + Cu(s)What is the rate of the reaction in mol/s at standard conditions (25°C and 1 atm)?

asked Jan 22 in ElectroChemistry by MalindaEarns (550 points)

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1 answer 63 views

A student wants to calculate the efficiency of an electrochemical cell with a standard potential of -0.74 volts. The cell is set up with a copper electrode immersed in a solution of copper(II) sulfate and a silver electrode immersed in a solution of silver nitrate, connected by a salt bridge. The student measures a current of 0.5 amperes flowing through the cell for a duration of 60 minutes. Calculate the efficiency of the electrochemical cell in terms of the amount of reactants consumed and the amount of product formed.

asked Jan 22 in ElectroChemistry by LeonardoHyla (290 points)

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