Recent questions in Physical Chemistry

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Here's a specific problem for the student to solve:Consider the reaction A(g) + B(g) ↔ C(g) with a standard enthalpy change of reaction (ΔH°rxn) of -50 kJ/mol at 298 K. If the initial concentrations of A and B are both 1.0 M, what will be the equilibrium concentration of each gas at 298 K? The equilibrium constant (Kc) for the reaction at 298 K is 2.75 x 10^-2.

asked 23 hours ago in Physical Chemistry by ClaritaCress (250 points)

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Here's a question for a chemistry student to solve:How does the entropy of a system change during a non-equilibrium process, and what factors determine the direction of the process? Use specific examples from real-world systems to illustrate your answer.

asked 23 hours ago in Physical Chemistry by WadeScroggin (370 points)

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Here's a problem for you to solve:What is the enthalpy change (∆H) for the combustion of methane (CH4) to form carbon dioxide (CO2) and water (H2O) based on the following information?CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l) ∆H = -890.4 kJ/molYou have a sample of methane and you want to determine the heat released or absorbed during combustion. How much heat is produced when you burn 5.00 grams of methane (CH4) at a constant pressure of 1 atm, assuming that the products are carbon dioxide (CO2) and water (H2O) and that the heat capacity of the calorimeter is negligible?

asked 23 hours ago in Physical Chemistry by GilbertoLoon (490 points)

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1 answer 28 views

Here's a precise problem for a chemistry student to solve:A gas, initially at a pressure of 1 atm and a temperature of 20°C, is contained in a cylinder with a volume of 5 L. If the gas is allowed to expand to a volume of 10 L at a constant temperature of 20°C, what is the final pressure of the gas? Use the ideal gas law equation to solve the problem.

asked 23 hours ago in Physical Chemistry by TomHatley066 (770 points)

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Here is a precise question for the student to solve:A chemical reaction occurs in a closed system that results in a change in temperature, but without any change in volume. Using non-equilibrium thermodynamics and irreversible processes, determine the amount of heat absorbed or released by the reaction if the entropy change is known to be 25 J/K.

asked 23 hours ago in Physical Chemistry by JeffrySchuhm (390 points)

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Here is a precise problem for the student to solve:How does the molecular weight of a polymer affect its physical properties such as viscosity and elasticity? Provide experimental evidence to support your answer.

asked 23 hours ago in Physical Chemistry by KellyeBucher (270 points)

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1 answer 37 views

Explain how the glass transition temperature of a polymer is influenced by its molecular weight and degree of branching.

asked 1 day ago in Physical Chemistry by DenishaVilla (230 points)

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1 answer 30 views

Determine the equilibrium constant (Kc) for the following reaction at a temperature of 298 K if the concentrations of reactants and products are [CO] = 0.10 M, [H2] = 0.20 M, and [CH3OH] = 0.05 M:CO(g) + 2H2(g) ↔ CH3OH(g)

asked 1 day ago in Physical Chemistry by MicahReidy99 (550 points)

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1 answer 25 views

Determine the crystal structure of a compound with the empirical formula C6H12O6, given its X-ray diffraction pattern.

asked 1 day ago in Physical Chemistry by SterlingOrne (410 points)

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Determine the concentration of copper ions in a copper sulfate solution by constructing an electrochemical cell and measuring its voltage using a standard hydrogen electrode.

asked 1 day ago in Physical Chemistry by LeesaStrub9 (530 points)

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Design and synthesize a supramolecular polymer with controlled assembly through non-covalent interactions, and investigate its structure and properties using various analytical techniques in the field of physical chemistry.

asked 1 day ago in Physical Chemistry by CorneliusSpe (330 points)

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1 answer 3 views

Consider the reaction: 2H2(g) + O2(g) → 2H2O(g) ΔH= −483.6 kJ/molAt constant temperature and pressure, 4 moles of hydrogen and 2 moles of oxygen are allowed to react. What is the maximum amount of work that can be obtained from this reaction?

asked 1 day ago in Physical Chemistry by DerrickLavin (470 points)

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1 answer 3 views

Consider a system that consists of water and sodium chloride (NaCl) at room temperature and atmospheric pressure. The student is asked to determine the minimum amount of NaCl that needs to dissolve in 100 grams of water in order to form a saturated solution. The student should also calculate the molar solubility of NaCl in the solution.

asked 1 day ago in Physical Chemistry by LatiaHipple6 (550 points)

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1 answer 21 views

Consider a gas confined to a container that can be divided into two compartments of equal volume. If one compartment initially contains N1 identical molecules at energy E1 and the other compartment contains N2 identical molecules at energy E2, what is the probability that the molecules will eventually be distributed equally between the two compartments? Use statistical mechanics and thermodynamic ensembles to calculate this probability.

asked 1 day ago in Physical Chemistry by MagnoliaReve (450 points)

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1 answer 18 views

Consider a container separated into two compartments by a barrier. One compartment has a gas at a pressure of 1 atm and the other compartment is empty. The barrier has a small hole in it, which allows the gas to diffuse from one compartment to another. If the rate of diffusion of the gas is 0.2 mL/min and the molar mass of the gas is 28g/mol, what is the mass of gas transferred through the hole in 5 hours?

asked 1 day ago in Physical Chemistry by SelenaHarric (570 points)

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1 answer 3 views

Consider a closed system undergoing an irreversible expansion at constant pressure, calculate the change in entropy of the system if the initial and final volumes are V1 and V2, respectively, and assuming ideal gas behavior.

asked 1 day ago in Physical Chemistry by IvanKittelso (470 points)

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1 answer 25 views

Calculate the weight-average molecular weight of a polymer sample with the following information:- The polydispersity index (PDI) of the sample is 1.5.- The number-average molecular weight (Mn) of the sample is 20,000 g/mol. - The weight fraction (w) of the polymer with a molecular weight of 30,000 g/mol is 0.2, and the weight fraction of the polymer with a molecular weight of 10,000 g/mol is 0.8.

asked 1 day ago in Physical Chemistry by NoahProctor (500 points)

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1 answer 22 views

Calculate the standard potential of a Daniell cell if the concentration of copper ions and zinc ions in their respective half-cells is 1.0 M and the temperature of the cell is 25°C. The standard reduction potentials of copper and zinc electrodes are +0.34 V and -0.76 V respectively.

asked 1 day ago in Physical Chemistry by KermitGodoy (330 points)

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1 answer 27 views

Calculate the standard Gibbs free energy change (ΔG°) for the reaction below at 298 K:2NO(g) + O2(g) → 2NO2(g)Given:ΔG°f(NO2(g)) = -51.29 kJ/molΔG°f(NO(g)) = 86.67 kJ/molΔG°f(O2(g)) = 0 kJ/mol

asked 1 day ago in Physical Chemistry by DJKScotty15 (590 points)

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1 answer 17 views

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 1 day ago in Physical Chemistry by WendyHenning (490 points)

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