Recent questions in Chemistry

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What is the exchange current density for the oxidation of iron in a 0.1 M Fe2+(aq) solution at 25°C, assuming the standard electrode potential for the Fe2+/Fe3+ couple is +0.77 V? The rate constant for the reaction is 1.2x10^-5 cm/s.

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the exchange current density for the oxidation of copper in a 0.1 M copper sulfate solution at 25°C using a platinum electrode?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the exchange current density for a corroding iron electrode in a 0.1 M solution of Fe2+ ions at 25°C, given that the rate constant for the electrode reaction is 1.2 x 10^-9 cm/s and the standard reduction potential for Fe2+/Fe is -0.44 V?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the exchange current density for a copper electrode in contact with a 1M solution of CuSO4 at a temperature of 25°C if the electrode potential is measured to be 0.25 V versus the standard hydrogen electrode?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the equilibrium constant for the reaction: 2H2 (g) + O2 (g) ⇌ 2H2O (g)at 298 K, given that the partial pressures of H2 and O2 are 0.15 atm and 0.10 atm, respectively, at equilibrium?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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Sure, here's a problem for you:Consider the following reaction: N2 (g) + 3 H2 (g) ⇌ 2 NH3 (g)If the equilibrium concentrations of N2, H2 and NH3 are 0.25 M, 0.75 M and 0.50 M, respectively, calculate the equilibrium constant (Kc) for the reaction.

asked Mar 1 in Chemical equilibrium by TheScientist (138k points)

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What is the equilibrium constant (Kc) for the reaction between potassium permanganate (KMnO4) and sulfur dioxide (SO2) in aqueous solution, given that sulfur dioxide is a weak reducing agent? Calculate the value of Kc at a temperature of 298 K.

asked Mar 1 in Chemical equilibrium by TheScientist (138k points)

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What is the equilibrium constant expression for the following reaction? 2 NO(g) + O2(g) ⇌ 2 NO2(g) Given that the initial concentrations of NO, O2, and NO2 were 0.025 M, 0.015 M, and 0 M, respectively, calculate the equilibrium constant (Kc) at 25°C.

asked Mar 1 in Chemical reactions by TheScientist (138k points)

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What is the equilibrium constant at a temperature of 298 K for the reaction 2NOCl(g) ⇌ 2NO(g) + Cl2(g) if the initial concentrations at equilibrium are [NOCl] = 0.200 M, [NO] = 0.0250 M, and [Cl2] = 0.0250 M?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the equilibrium constant for the reaction N2 (g) + 3H2 (g) ↔ 2NH3 (g) at a temperature of 400°C and a pressure of 10 atm?

asked Mar 1 in Chemical equilibrium by TheScientist (138k points)

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Using spectroscopic data, calculate the equilibrium constant (K) for the formation of the complex ion Cu(NH3)42+ in a solution containing 0.02 M Cu2+ and 0.5 M NH3 at room temperature.

asked Mar 1 in Chemical equilibrium by TheScientist (138k points)

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One mole of neon gas is heated at constant pressure, and its initial temperature is 300 K. The neon gas is then allowed to expand isothermally and reversibly until its volume triples. What is the entropy change of the neon gas during the process?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the entropy change for the combustion of methane (CH4) at constant pressure and standard conditions (298 K and 1 atm)?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the entropy change for a monatomic ideal gas when the gas expands isothermally from volume V1 to volume V2 inside a container at temperature T?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the entropy change when 2 moles of water vapor (H2O(g)) condense to liquid water (H2O(l)) at 100°C and 1 atm pressure?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the entropy change (ΔS) for the reaction of burning 2 moles of methane gas (CH4) in excess oxygen gas (O2) at standard conditions? The balanced chemical equation for this reaction is:CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the entropy change (∆S) for the reaction: 2H2(g) + O2(g) → 2H2O(l) given the standard entropy values ∆S°(H2(g)) = 130.6 J/K·mol ∆S°(O2(g)) = 205.0 J/K·mol ∆S°(H2O(l)) = -69.9 J/K·mol

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the entropy change (∆S) for the following reaction?2H2(g) + O2(g) → 2H2O(l)Given that the standard molar entropy of H2(g), O2(g), and H2O(l) are 131.3 J/K•mol, 205.0 J/K•mol, and 70.0 J/K•mol respectively.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the enthalpy of vaporization of water if 50.0 g of water at 100°C is converted to steam at 100°C? The heat capacity of water is 4.184 J/g°C and the molar heat of vaporization of water is 40.7 kJ/mol.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the enthalpy of vaporization of water if it takes 40 kJ of energy to vaporize 20 g of water at 100°C?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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