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What is the maximum yield of p-nitroaniline that can be obtained when 50g of aniline is reacted with an excess of nitric acid to form p-nitroaniline, assuming that the reaction goes to completion and all other reaction conditions remain constant?

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

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What is the theoretical yield of acetylsalicylic acid that can be obtained from 5 grams of salicylic acid and 10 grams of acetic anhydride, assuming a 100% conversion rate and perfect reaction conditions?

asked Mar 1 in Chemical synthesis 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 rate constant for the reaction A + B → C if the activation energy is 50 kJ/mol and the temperature is 300 K? Also, predict the order of reaction based on the mechanism proposed.

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

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What is the exchange current density for the oxidation of copper in a 0.1 M copper sulfate solution at 25°C using a platinum electrode?

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

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What is the power output of an electrochemical cell with a standard potential of +0.34 V and a current of 2.5 A flowing through it for 3 hours?

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

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What is the polarization in an electrochemical cell when the current density is 200 A/m², the effective surface area of the electrode is 50 cm², the electrode potential is -0.5V and the electrolyte resistance is 10 Ω?

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

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What is the surface area of a given sample of activated carbon powder, if it has adsorbed 12mL of nitrogen gas at 77 K and a pressure of 1 atm, and assuming the cross-sectional area of a nitrogen molecule to be 0.16 nm²?

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

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What is the bond dissociation energy of the carbon-hydrogen bond in methane (CH4) when using experimental data from a combustion reaction that indicates the combustion of 1 mole of methane releases 890.4 kJ of heat?

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

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How does the change in solvent polarity affect the reaction rate in the photochemical reaction of (insert specific compound here)?

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

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What is the standard free energy change for the following redox reaction at 298 K?Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)Given: E°(Cu2+/Cu) = 0.34 V and E°(Zn2+/Zn) = -0.76 V

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

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What is the wavelength of the photon emitted when an electron in a hydrogen atom relaxes from the second excited state to the ground state using quantum chemical calculations of excited states?

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

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What is the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C, measured using a pH meter with a sensitivity of 0.01 pH units?

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

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What is the standard enthalpy change for the fusion of 10 grams of ice at 0°C to liquid water at 25°C? Given the standard enthalpy of fusion for ice is 6.01 kJ/mol and the specific heat capacity of water is 4.18 J/g°C.

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

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In an experiment, 50 mL of 1 M HCl solution was mixed with 50 mL of 1 M NaOH solution. The temperature change was recorded as 10°C. Calculate the standard enthalpy change of neutralization for the reaction between HCl and NaOH.

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

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What is the standard enthalpy change of dissolution for 5.00 grams of solid sodium hydroxide (NaOH) in 100.0 mL of water at 25°C? Given: The molar enthalpy of dissolution of NaOH is -44.51 kJ/mol and the density of water is 0.997 g/mL.

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

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What is the formal charge on the nitrogen atom (N) in the ammonium ion (NH4+)? Show your calculation steps.

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

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How long would it take for a molecule of oxygen to diffuse through a membrane that is 2 mm thick at a given temperature and pressure? What factors affect the rate of diffusion for this particular gas?

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

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What is the enthalpy change for dissolving 10 grams of sodium chloride (NaCl) in 200 mL of water at 25°C if the final temperature of the solution is 30°C? Given: the enthalpy of solution for NaCl is -3.9 kJ/mol.

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

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What is the enthalpy change for the following chemical reaction?2H2 (g) + O2 (g) → 2H2O (l)Given the enthalpy of formation values:ΔHf°(H2O) = -285.8 kJ/molΔHf°(H2) = 0 kJ/molΔHf°(O2) = 0 kJ/mol

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

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