Recent questions in Physical Chemistry

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Calculate the change in internal energy of a system that releases 350 J of heat to the surroundings and does 200 J of work on its surroundings?

asked Jan 23 in Physical Chemistry by RaquelGendro (430 points)

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1 answer 49 views

Calculate the change in entropy when 1 mole of an ideal gas is compressed from 4 L to 1 L irreversibly at a temperature of 298 K.

asked Jan 23 in Physical Chemistry by CarrieGabel2 (510 points)

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1 answer 45 views

Calculate the change in enthalpy for the reaction CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) given that the enthalpies of formation for CH4 (g), CO2 (g) and H2O (l) are -74.81 kJ/mol, -393.51 kJ/mol and -285.83 kJ/mol respectively.

asked Jan 23 in Physical Chemistry by JameyCallist (230 points)

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1 answer 39 views

Calculate the change in enthalpy for the combustion of 2 moles of methane gas (CH4) at a constant pressure of 1 atmosphere and a temperature of 298 K. Given the standard enthalpy of formation for methane is -74.81 kJ/mol.

asked Jan 23 in Physical Chemistry by VirgilioGree (470 points)

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1 answer 40 views

Calculate the change in enthalpy (ΔH) for the following reaction at 25°C given the standard enthalpies of formation for each compound: 2H2(g) + O2(g) → 2H2O(g) Standard enthalpies of formation: ΔHf° (H2O)(g) = -241.82 kJ/molΔHf° (H2)(g) = 0 kJ/molΔHf° (O2)(g) = 0 kJ/mol

asked Jan 23 in Physical Chemistry by ShadPilkingt (470 points)

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1 answer 52 views

Calculate the change in enthalpy (ΔH) for the combustion of methane gas (CH4) at 25°C and constant pressure of 1 atm. The equation for the combustion of methane is:CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) Given the standard enthalpies of formation at 25°C are:ΔHf[CH4 (g)] = -74.87 kJ/mol ΔHf[CO2 (g)] = -393.5 kJ/mol ΔHf[H2O (l)] = -285.8 kJ/mol Assume that water is in its liquid phase at the end of the reaction.

asked Jan 23 in Physical Chemistry by ACRBianca429 (650 points)

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1 answer 52 views

Calculate the bond order of the nitrogen molecule (N2) using molecular orbital theory.

asked Jan 23 in Physical Chemistry by PoppyPinscho (310 points)

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1 answer 54 views

Calculate the average energy and specific heat capacity of a system containing 1000 molecules of an ideal gas at a temperature of 300 K, when the gas is subjected to an isochoric process and its volume remains constant at 2.5 L.

asked Jan 23 in Physical Chemistry by CedricCurrey (370 points)

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1 answer 57 views

Calculate the amount of heat released when 10.0 g of methane gas (CH4) is burned in excess oxygen at constant pressure, given that the enthalpy of combustion of methane is -890.3 kJ/mol.

asked Jan 23 in Physical Chemistry by MichaleRenne (230 points)

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1 answer 51 views

Calculate the amount of heat released when 10.0 g of methane (CH4) is burned completely in excess oxygen if the enthalpy of combustion of methane is -890 kJ/mol.

asked Jan 23 in Physical Chemistry by MichelleHoli (490 points)

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1 answer 45 views

At a particular temperature and pressure, a mixture of water and ethanol has a vapor pressure of 45 torr. What is the mole fraction of ethanol in the mixture if its total pressure is 760 torr?

asked Jan 22 in Physical Chemistry by LucieEdments (430 points)

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1 answer 49 views

Assuming a carbon-carbon double bond length of 1.33 Å and a carbon-hydrogen single bond length of 1.09 Å, what is the approximate bond length of a carbon-carbon triple bond in a molecule with a linear geometry?

asked Jan 22 in Physical Chemistry by PaulineF6290 (470 points)

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1 answer 6 views

As a chemistry student, how can you determine the effect of temperature on the conductivity of 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid?

asked Jan 22 in Physical Chemistry by Kandace46Y6 (450 points)

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1 answer 7 views

An unknown compound is suspected to be a crystal structure of sodium chloride. Using X-ray crystallography techniques, determine if the compound is indeed a sodium chloride crystal structure and calculate the lattice parameters of the crystal.

asked Jan 22 in Physical Chemistry by CatalinaBerg (630 points)

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1 answer 47 views

A student wishes to determine the standard reduction potential of an unknown metal electrode in a half-cell. They set up an electrochemical cell using a known standard hydrogen electrode (SHE) as the reference electrode and the unknown metal electrode as the working electrode. A voltmeter is used to measure the potential difference between the two electrodes. The reading is +0.45 V. What is the standard reduction potential of the unknown metal electrode in volts?

asked Jan 22 in Physical Chemistry by YMPViola5184 (450 points)

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1 answer 49 views

A student wants to know the equilibrium concentration of hydrogen gas and nitrogen gas at a particular temperature and pressure when they are mixed in a container in a 2:1 ratio. The student also wants to calculate the equilibrium constant of the reaction when nitrogen and hydrogen form ammonia. Can you help the student by designing a step-by-step procedure to find the equilibrium concentrations and equilibrium constant at the given conditions?

asked Jan 22 in Physical Chemistry by MckenziePxd8 (470 points)

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1 answer 35 views

A student wants to investigate the thermodynamic properties of a system undergoing a non-equilibrium process. The system is initially at a temperature of 300 K and pressure of 1 atm. A sudden expansion of the system causes the pressure to drop to 0.5 atm while maintaining a constant temperature. Calculate the change in entropy of the system during the process assuming ideal gas behavior.

asked Jan 22 in Physical Chemistry by RodneyClubbe (610 points)

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1 answer 42 views

A student wants to calculate the standard cell potential for a galvanic cell that consists of a silver electrode and a copper electrode. The silver electrode has a silver ion concentration of 0.05 M and the copper electrode has a copper ion concentration of 0.1 M. What is the standard cell potential for this cell?

asked Jan 22 in Physical Chemistry by RebekahOsbor (510 points)

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1 answer 49 views

A student needs to determine the diffusion coefficient of a gas in a liquid by measuring the rate of diffusion using a diffusion cell. If the student knows the initial concentration and final concentration of the gas in the cell, and the time it took for diffusion to occur, what is the diffusion coefficient of the gas in the liquid?

asked Jan 22 in Physical Chemistry by IrvinLeichha (410 points)

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1 answer 38 views

A student needs to determine the diffusion coefficient of a gas at a given temperature and pressure using Graham's law of diffusion. The student has the necessary equipment to measure the rate of diffusion of the gas and the molecular weight of the gas is known. Determine the diffusion coefficient of the gas.

asked Jan 22 in Physical Chemistry by RenaUxo07372 (470 points)

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