Recent questions in Physical Chemistry

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A chemistry student needs to determine the conditions required for a liquid mixture of water and ethanol to boil at a temperature of exactly 80°C. What is the minimum percentage of ethanol needed in the mixture and at what pressure should it be boiled in order to achieve this specific boiling point?

asked Jan 22 in Physical Chemistry by RickHerron90 (550 points)

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A chemistry student needs to determine the conditions at which a pure substance will change from solid to liquid phase. The substance in question has a melting point of 120 °C and a heat of fusion of 35 kJ/mol. How much heat is required to melt 100 grams of the substance at its melting point? And, what is the temperature at which the substance will start to solidify if the ambient pressure is 1 atm and the substance has cooled from its liquid phase at 150 °C to its solid phase?

asked Jan 22 in Physical Chemistry by SOSMarilyn83 (710 points)

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A chemistry student must determine the maximum work that can be done by a gas held in a container with a fixed volume and temperature. Given the number of moles of gas and the pressure inside the container, use statistical mechanics and thermodynamic ensembles to calculate the maximum work that can be extracted from the gas.

asked Jan 22 in Physical Chemistry by Fern52B69739 (450 points)

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A chemistry student must calculate the boiling point of a solution composed of 10 g of glucose (C6H12O6) dissolved in 100 g of water at 1 atm pressure. The boiling point elevation constant for water (Kb) is equal to 0.512°C/m, and the normal boiling point of pure water is 100°C.

asked Jan 22 in Physical Chemistry by Eddie97G1445 (410 points)

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A chemistry student is trying to determine the boiling point of a solution containing 30 grams of glucose (C6H12O6) dissolved in 100 grams of water. Given that the boiling point of pure water is 100°C and the elevation constant for water is 0.512°C/m, what is the boiling point of the solution?

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

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A chemical reaction was carried out at constant temperature and pressure. The initial concentration of the reactants and products were known. After a certain amount of time, the concentration of the reactants and products were measured. Using non-equilibrium thermodynamics, calculate the magnitude and sign of the entropy change of the system during the reaction.

asked Jan 22 in Physical Chemistry by MeaganLehman (490 points)

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A bottle contains a mixture of nitrogen and oxygen gases. At a specific temperature and pressure, the nitrogen molecules move on an average velocity of 500 m/s and oxygen molecules move at 400 m/s. What is the partial pressure of nitrogen and oxygen in the mixture if the total pressure of the gas is 1 atm?

asked Jan 22 in Physical Chemistry by OfeliaRansom (530 points)

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A beaker of water is placed on a hot plate, and the temperature is gradually increased. Write an equation for the rate of change of entropy with respect to time during this process, assuming the system is not in equilibrium. Use the equation to determine the rate of entropy production in the water as it is heated from 25°C to 100°C at a constant rate of 2°C/min.

asked Jan 22 in Physical Chemistry by KFUBrayden3 (430 points)

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A beaker containing 1L of water is divided into two equal compartments by a semi-permeable membrane. One side of the membrane has 1M NaCl solution and the other side is pure water. Determine the time taken for the concentration of NaCl on both sides of the membrane to become equal through diffusion. Given: Molecular weight of NaCl is 58.44 g/mol, and diffusion coefficient of NaCl in water is 1.6 x 10^-9 m^2/s.

asked Jan 22 in Physical Chemistry by MellisaNauma (370 points)

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1 answer 60 views

A bottle contains a mixture of nitrogen and oxygen gases. At a specific temperature and pressure, the nitrogen molecules move on an average velocity of 500 m/s and oxygen molecules move at 400 m/s. What is the partial pressure of nitrogen and oxygen in the mixture if the total pressure of the gas is 1 atm?

asked Jan 22 in Physical Chemistry by ConnieMacken (670 points)

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1 answer 43 views

A beaker of water is placed on a hot plate, and the temperature is gradually increased. Write an equation for the rate of change of entropy with respect to time during this process, assuming the system is not in equilibrium. Use the equation to determine the rate of entropy production in the water as it is heated from 25°C to 100°C at a constant rate of 2°C/min.

asked Jan 22 in Physical Chemistry by RozellaBranc (350 points)

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A beaker containing 1L of water is divided into two equal compartments by a semi-permeable membrane. One side of the membrane has 1M NaCl solution and the other side is pure water. Determine the time taken for the concentration of NaCl on both sides of the membrane to become equal through diffusion. Given: Molecular weight of NaCl is 58.44 g/mol, and diffusion coefficient of NaCl in water is 1.6 x 10^-9 m^2/s.

asked Jan 22 in Physical Chemistry by VenusMonash4 (850 points)

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