Recent questions in Chemistry

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What is the amount of energy required to melt 50 grams of ice at 0 °C to water at the same temperature? Given the enthalpy of fusion of water is 6.01 kJ/mol.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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1 answer 39 views

What is the amount of energy required to break the carbon-hydrogen bond in a methane molecule (CH4) if the bond dissociation energy (BDE) of C-H is 413 kJ/mol?

asked Mar 1 in Chemical reactions 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 energy difference between the ground state and the first excited state of a hydrogen atom using quantum chemical calculations?

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

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What is the difference in energy between the ground state and first excited state of a H2 molecule using the time-dependent Schrödinger equation and what is the resulting wavelength of light absorbed or emitted during the transition?

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

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What is the energy difference between the ground state and first excited state of the hydrogen atom using quantum chemical calculations?

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

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What is the electrical conductivity of a solution containing 0.1 M sodium chloride and 0.2 M potassium nitrate at room temperature (25 °C) and a cell constant of 1.0 cm-1?

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

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What is the electrical conductivity (in S/cm) of a 0.1 M solution of potassium chloride (KCl) at 25 degrees Celsius?

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

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1 answer 34 views

What is the efficiency of an electrochemical cell with a standard potential of +0.80V and a current of 2.5A, when the cell potential drops to +0.60V as a result of an internal resistance of 1.2Ω?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the efficiency of an electrochemical cell in which a current of 1.5 A is passed for 2 hours between two electrodes, given that the potential difference between the electrodes is 1.5 V and the total energy consumed is 5400 Joules?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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1 answer 36 views

What is the efficiency of an electrochemical cell that operates with a potential difference of 1.5V and has a maximum electrical work output of 2500 J when 10 moles of electrons are transferred in the cell reaction? (Assuming no other energy losses)

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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1 answer 49 views

What is the efficiency of an electrochemical cell with a voltage of 0.8V and a current of 2 mA when Cu and Ag electrodes are used in a CuSO4 and AgNO3 electrolyte solution, with an electrode area of 10cm² and a duration of 3 hours?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the efficiency of an electrochemical cell with a standard potential of 1.5V when the measured potential is 1.2V and the current passing through the cell is 0.5A for 2 hours? (Assume the cell is operating under standard conditions.)

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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1 answer 44 views

What is the dipole moment of the polar molecule CHCl3?

asked Mar 1 in Chemical bonding by TheScientist (138k points)

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1 answer 31 views

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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1 answer 30 views

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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1 answer 38 views

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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1 answer 39 views

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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1 answer 35 views

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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1 answer 23 views

What is the density of a sample of sodium chloride (NaCl) with a mass of 5.0 grams and a volume of 2.0 mL? Show all computations and include units in the final answer.

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

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