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A student wants to know how changing the volume affects the position of the equilibrium for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). If the reaction is initially at equilibrium in a 2 L container at 400 K and then the volume is decreased to 1 L, what will be the new concentrations of each gas at equilibrium? (Assume that the pressure remains constant and that the reaction follows the ideal gas law.)

asked Jan 22 in Chemical equilibrium by XHQMikel9006 (2.0k points)

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1 answer 63 views

A student wants to investigate the thermodynamic properties of a system undergoing a non-equilibrium process. The system is initially at a temperature of 300 K and pressure of 1 atm. A sudden expansion of the system causes the pressure to drop to 0.5 atm while maintaining a constant temperature. Calculate the change in entropy of the system during the process assuming ideal gas behavior.

asked Jan 22 in Physical Chemistry by EdgardoHinch (2.2k points)

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1 answer 65 views

A student wants to investigate the effect of volume change on the equilibrium position of the reaction 2SO2(g) + O2(g) ⇄ 2SO3(g). The initial equilibrium concentration of SO3 is 0.1 M at a constant temperature. The volume is reduced by half at equilibrium. Calculate the new equilibrium concentrations of SO2, O2 and SO3 assuming the equilibrium constant (Kc) of the reaction remains constant.

asked Jan 22 in Chemical equilibrium by KreogMoore5 (6.4k points)

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1 answer 41 views

A student wants to find the equilibrium constant for the following reaction at a temperature of 298 K:2NO(g) + Cl2(g) ⇌ 2NOCl(g)The student measures the equilibrium concentrations to be [NO] = 0.050 M, [Cl2] = 0.025 M, and [NOCl] = 0.080 M. What is the equilibrium constant (Kc) for the reaction at this temperature?

asked Jan 22 in Chemical reactions by VetaPetterd1 (1.7k points)

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1 answer 52 views

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 IWHJaxon1452 (2.1k points)

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1 answer 74 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 RachelMcCann (2.2k points)

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1 answer 61 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 TatianaSteil (2.3k points)

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1 answer 30 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 DeboraMccomb (1.9k points)

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1 answer 13 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 EdwardCecili (1.9k points)

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1 answer 52 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 MaryellenGra (2.1k points)

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1 answer 56 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 RandolphWvo (1.9k points)

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1 answer 56 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 TrenaSee705 (1.7k points)

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1 answer 62 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 JeannetteNun (1.6k points)

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1 answer 45 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 GavinMott60 (1.8k points)

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1 answer 40 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 MacLgq130601 (2.4k 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 52 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 Lori71654888 (2.0k points)

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1 answer 61 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 JereGerald1 (1.6k 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 WilburGuerre (2.3k points)

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1 answer 68 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 JoyEdge34400 (2.3k points)

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