Recent questions in Physical Chemistry

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1 answer 91 views

How can computational chemistry and molecular modeling be used to predict the chemical and physical properties of a new drug molecule before it's synthesized, allowing researchers to make informed decisions about its potential effectiveness and safety?

asked Feb 5 in Physical Chemistry by CheryleKirso (2.1k points)

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1 answer 74 views

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 Feb 4 in Physical Chemistry by Lettie458244 (1.9k points)

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1 answer 125 views

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 Feb 4 in Physical Chemistry by AnnKetner183 (2.3k points)

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1 answer 181 views

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 Feb 4 in Physical Chemistry by AnnKetner183 (2.3k points)

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1 answer 217 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 Feb 4 in Physical Chemistry by EfrainAlarco (2.2k points)

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1 answer 175 views

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 Feb 4 in Physical Chemistry by MarielScully (1.4k points)

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1 answer 88 views

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 Feb 4 in Physical Chemistry by August936905 (1.5k points)

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1 answer 158 views

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

asked Feb 4 in Physical Chemistry by MyrnaFaerber (1.8k points)

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1 answer 132 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 Feb 4 in Physical Chemistry by MarianCocket (2.0k points)

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1 answer 127 views

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

asked Feb 4 in Physical Chemistry by KrystleFarth (1.7k points)

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1 answer 115 views

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 Feb 4 in Physical Chemistry by AmeliaCuella (1.8k points)

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1 answer 21 views

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 Feb 4 in Physical Chemistry by Linwood6326 (2.3k points)

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1 answer 67 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 Feb 3 in Physical Chemistry by GabrieleVanw (1.9k points)

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1 answer 80 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 Feb 3 in Physical Chemistry by DomenicAsbur (2.1k points)

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1 answer 128 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 Feb 3 in Physical Chemistry by MarianneBarc (1.7k points)

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1 answer 183 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 Feb 3 in Physical Chemistry by KatriceS6445 (1.7k points)

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1 answer 80 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 Feb 3 in Physical Chemistry by CarleyK5281 (2.0k points)

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1 answer 153 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 Feb 3 in Physical Chemistry by RobertoLafla (2.1k points)

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1 answer 141 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 Feb 3 in Physical Chemistry by KristeenN708 (2.1k points)

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1 answer 160 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 Feb 3 in Physical Chemistry by Milagros70T7 (1.5k points)

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