Recent questions in Physical Chemistry

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What is the probability of finding a system composed of two ideal gas particles in a given volume, temperature and energy range? Use statistical mechanics and the canonical ensemble to calculate the probability and explain your results.

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

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What is the minimum amount of energy required to break H2O molecules in a system consisting of 100 water molecules at a temperature of 298 K? Use statistical mechanics and thermodynamic ensembles to solve the problem.

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

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What is the maximum work that can be obtained in a non-equilibrium process with a system at a given temperature and pressure, if the entropy change of the system is known? Calculate the answer assuming ideal gas behavior.

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

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What is the maximum amount of work that can be obtained from a reversible isothermal expansion of a gas at 25°C when the initial pressure is 4.00 atm and the final pressure is 1.00 atm and the initial volume of the gas is 3.00 L?

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

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What is the heat released or absorbed when 2 moles of hydrogen gas reacts with 1 mole of oxygen gas to form 2 moles of water vapor at constant volume? The enthalpy change for this reaction is -483.7 kJ/mol.

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

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What is the heat released or absorbed when 50 grams of methane ($CH_{4}$) is burnt completely in oxygen ($O_{2}$) at a constant pressure of 1 atm? The heat of combustion of methane is -890.4 kJ/mol.

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

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What is the heat released during the combustion of 5 grams of propane (C3H8) at constant volume, given that the enthalpy change of combustion of propane is -2220 kJ/mol?

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

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What is the heat evolved when 25 grams of NaOH is dissolved in 500 mL of water at 25°C, given that the enthalpy of solution of NaOH is -44.5 kJ/mol?

asked Mar 1 in Physical Chemistry 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 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 enthalpy change for the combustion of methane gas in a bomb calorimeter?

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

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What is the enthalpy change when 1.50 moles of methane (CH4) is burned in excess oxygen gas (O2) under standard conditions, if the combustion reaction releases 890.4 kJ of heat? (Assuming all reactants and products are in their standard states)

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

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What is the enthalpy change (ΔH) for the combustion of methane gas (CH4) at constant pressure (1 atm) if 5.5 grams of methane is completely burned in a bomb calorimeter and the temperature increases by 14.6°C?

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

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What is the energy of the vibrational mode that gives rise to an absorption band at 1712 cm$^{-1}$ in the IR spectrum of a molecule of acetic anhydride (C$_4$H$_6$O$_3$)?

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

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What is the diffusivity of oxygen gas in air at 25°C and 1 atm pressure? Assume ideal gas behavior and provide your answer in SI units.

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

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What is the diffusion coefficient of oxygen in air at a temperature of 298 K and a pressure of 1 atm? Show the calculation and units used.

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

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What is the diffusion coefficient of oxygen gas in air at a temperature of 25°C and 1 atm pressure?

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

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What is the diffusion coefficient of a solute with a molecular weight of 100 g/mol in water at 25°C, when the solute concentration is 0.01 M and the diffusion rate is 1.5 × 10^-5 cm^2/s?

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

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What is the diffusion coefficient of a gas (in cm²/s) at 25°C and 1 atm pressure if its root-mean-square velocity is 400 m/s and the gas constant R is 8.314 J/mol·K? The gas has a molar mass of 32 g/mol and a collision diameter of 3.5 Å.

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

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What is the change in internal energy of a system when two moles of hydrogen gas react with one mole of oxygen gas to form two moles of water vapor at constant temperature and pressure?

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

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