Recent questions in Physical Chemistry

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Calculate the standard free energy change (∆G°) for the reaction: 2CH4(g) + 3O2(g) → 2CO2(g) + 2H2O(l) at 298 K, given that the standard enthalpy change (∆H°) of the reaction is -890.4 kJ mol^-1 and the standard entropy change (∆S°) of the reaction is +292.2 J K^-1 mol^-1. Is the reaction spontaneous or non-spontaneous under standard conditions?

asked Feb 3 in Physical Chemistry by JaysonPlott5 (1.6k points)

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Calculate the standard enthalpy change of the following chemical reaction at 298 K given the following bond energies: 2H2(g) + O2(g) --> 2H2O(l) Bond energies: H-H: 432 kJ/mol O=O: 498 kJ/mol O-H: 464 kJ/mol

asked Feb 3 in Physical Chemistry by TawannaHaine (2.3k points)

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Calculate the standard enthalpy change (in kJ/mol) for the following chemical reaction at 298 K:2SO2(g) + O2(g) → 2SO3(g)Given the standard enthalpies of formation (∆Hf°) at 298 K for SO2(g), O2(g), and SO3(g) are -296.8 kJ/mol, 0 kJ/mol, and -396.0 kJ/mol, respectively.

asked Feb 3 in Physical Chemistry by ClarkPuig93 (2.0k points)

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1 answer 113 views

Calculate the standard cell potential of the following electrochemical cell: Ag(s) │ AgCl(s) │ Cl^-(aq, 0.040 M) ‖ Cu^2+(aq, 0.020 M) │ Cu(s) at 298 K. The reduction potential of AgCl/Ag couple is +0.22 V and the reduction potential of Cu^2+/Cu couple is +0.34 V.

asked Feb 3 in Physical Chemistry by XHQMikel9006 (2.0k points)

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1 answer 165 views

Calculate the standard cell potential of the following electrochemical cell at 298 K, given the half-reactions and their standard reduction potentials in brackets:Cu(s) | Cu^2+(0.001 M) || Ag+(0.1 M) | Ag(s)

asked Feb 3 in Physical Chemistry by GingerJ92570 (1.6k points)

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Calculate the standard cell potential (E°) for the following electrochemical cell:Zn(s) | Zn2+(aq, 0.100M) || Cr3+(aq, 0.050M) | Cr(s)Given: E°cell (Zn2+/Zn) = -0.76 VE°cell (Cr3+/Cr) = -0.74 V

asked Feb 3 in Physical Chemistry by GavinMott60 (1.8k points)

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1 answer 29 views

Calculate the rate constant at 300 K for a gas phase reaction with a rate of 0.025 M/s and an initial concentration of 0.10 M. The reaction is second order in the concentration of reactants.

asked Feb 3 in Physical Chemistry by RebekahH3016 (1.9k points)

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1 answer 141 views

Calculate the partition function for a system of 300 molecules occupying an energy level of 10 J at a temperature of 300 K using the classical harmonic oscillator model.

asked Feb 3 in Physical Chemistry by Juliana93U49 (2.3k points)

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1 answer 134 views

Calculate the partition function for a system of 10 molecules of a monoatomic gas confined to a 1-dimensional box of length 1 nm at a temperature of 300 K using the classical and quantum mechanical methods. Then, compare the results obtained and explain the discrepancies observed.

asked Feb 3 in Physical Chemistry by ChloeBodnar (2.0k points)

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Calculate the partition function (q) and the Helmholtz free energy (A) of an ideal gas containing 2 moles of particles at a temperature of 300 K, assuming the gas is in the canonical ensemble.

asked Feb 3 in Physical Chemistry by JanniePeek84 (2.0k points)

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1 answer 176 views

How does changing the temperature of a chemical reaction affect the activation energy barrier in the reaction? Use computational chemistry and molecular modeling to calculate the activation energy barriers for the same reaction at different temperatures and explain the change in activation energy with temperature.

asked Feb 3 in Physical Chemistry by SybilBruche (1.8k points)

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1 answer 119 views

How does changing the concentration of a catalyst affect the rate of the catalyzed reaction? Provide experimental data to support your answer.

asked Jan 31 in Physical Chemistry by WallaceMaria (2.4k points)

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What is the effect of changing the anion of an ionic liquid on its physical properties?

asked Jan 31 in Physical Chemistry by Miguel37A006 (2.3k points)

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What parameters affect catalytic activity and selectivity in the hydrogenation of ethylene to ethane using a platinum-based catalyst?

asked Jan 31 in Physical Chemistry by AliceW140134 (2.0k points)

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1 answer 128 views

What is the effect of different types of catalysts (such as homogenous and heterogeneous catalysts) on the rate of a specific reaction, and how can this be practically applied in industrial processes?

asked Jan 31 in Physical Chemistry by FletaStepp73 (2.0k points)

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1 answer 127 views

What is the effect of catalysts on the rate of a chemical reaction in terms of activation energy? And, using the Arrhenius equation, calculate the activation energy for the catalyzed and non-catalyzed reactions and compare the two values.

asked Jan 31 in Physical Chemistry by AlishaGuy35 (2.5k points)

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1 answer 116 views

What are the vibrational frequencies of carbon dioxide and how do they relate to the molecular geometry of the molecule?

asked Jan 31 in Physical Chemistry by KristalDmb02 (1.6k points)

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1 answer 130 views

What is the molecular structure and geometry of carbon dioxide according to quantum mechanics principles?

asked Jan 31 in Physical Chemistry by NelleVxq8414 (1.5k points)

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1 answer 90 views

What are the molecular vibrations of carbon dioxide and how do they contribute to its infrared spectrum?

asked Jan 31 in Physical Chemistry by AnjaAbt20068 (2.0k points)

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1 answer 114 views

What is the vibrational frequency of carbon dioxide (CO2) using infrared spectroscopy?

asked Jan 31 in Physical Chemistry by CollinByrd4 (1.4k points)

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