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What is the activation energy for a chemical reaction that has a rate constant of 2.5 × 10^-3 s^-1 at a temperature of 298 K, when the frequency factor is 5 × 10^13 s^-1?

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

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Sure, here is a precise problem for the student to solve:Calculate the heat capacity (in J/K) of a 50.0 g sample of an unknown substance that requires 167 J to increase its temperature by 5.00 °C.

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

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Sure, here's a problem for a chemistry student to solve:Calculate the acid dissociation constant (Ka) of a 0.1 M solution of acetic acid, given its pH is 3.7. The pKa value of acetic acid is 4.74.

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

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What is the theoretical yield of 2,4-dichloronitrobenzene that can be obtained from reacting 10 grams of nitrobenzene with excess chlorine gas?

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

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What is the exchange current density for the oxidation of iron in a 0.1 M solution of Fe2+/Fe3+ at 25°C if the standard potential of the couple is +0.77 V and the overpotential is 0.2 V?

asked Mar 1 in ElectroChemistry 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 are the common misconceptions that students have when trying to understand the organization of the periodic table? How can these misconceptions be overcome to better understand the properties and trends of chemical elements within the table?

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

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What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(l) Given that the standard enthalpy of formation for H2O(l) is -285.8 kJ/mol, and the standard enthalpy of formation for H2(g) and O2(g) are 0 kJ/mol.

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

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What is the balanced redox reaction between potassium permanganate and oxalic acid in acidic medium?

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

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How can we accurately calculate the band gap energy and optical properties of a semiconductor quantum dot with a radius of 5 nm using density functional theory (DFT)?

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

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What is the enthalpy change in kilojoules for the reaction:2H2(g) + O2(g) → 2H2O(l)given that the standard enthalpy of formation for liquid water is -285.8 kJ/mol, and the standard enthalpy of formation for hydrogen gas and oxygen gas are 0 kJ/mol?

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

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What is the yield of benzocaine that can be obtained by the reaction of 5 grams of p-aminobenzoic acid and 10 mL of ethanol assuming 100% conversion efficiency and pure product formation?

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

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What is the balanced redox equation for the reaction of potassium permanganate with iron(II) sulfate in acidic solution?

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

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What is the corrosion rate of a zinc electrode coupled to a copper electrode in a 0.1 M aqueous solution of NaCl if the galvanic couple has a potential of 0.8 V and a surface area of 4 cm² for the zinc electrode?

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

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1 answer 81 views

What is the magnetic moment of a molecule with a given geometry and electron configuration?

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

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What is the bond energy (in kJ/mol) required to break apart a single molecule of methane (CH4) into its individual atoms (C and 4H)?

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

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What is the Gibbs free energy change for the reaction of hydrogen gas (H2) and chlorine gas (Cl2) to form hydrochloric acid (2HCl) at standard conditions (298 K and 1 atm)?

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

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Identify the type of intermolecular forces present in acetone (CH3COCH3). Explain why this particular type of intermolecular force is present in acetone.

asked Feb 28 in Chemical bonding by TheScientist (138k points)

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What is the corrosion rate of iron in a 1M HCl solution at 25°C given its weight loss of 2.3 grams over a period of 48 hours? The atomic weight of iron is 55.85 g/mol and its density is 7.87 g/cm³.

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

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What is the bond dissociation energy of the O-H bond in a water molecule? Use the given data: the enthalpy change for the reaction H2(g) + 1/2O2(g) --> H2O(l) is -285.8 kJ/mol and the average bond energy of an O-H bond is 463 kJ/mol.

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

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