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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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How can we design a system for the production of cosmetics that takes into account the desired chemical properties of the final product and the raw materials used, while also ensuring safety and efficient production?

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

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What is the rate of reaction for the combustion of methane in which 4.7 grams of methane reacts in 3.5 seconds to produce 11.2 grams of water vapor and carbon dioxide gas?

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

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What is the minimum amount of heat energy required to vaporize 50 grams of water at its boiling point, given the enthalpy of vaporization of water to be 40.7 kJ/mol?

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

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What is the standard enthalpy change for the reaction of 2-methylpropan-2-ol (C4H10O) with oxygen gas (O2) to form carbon dioxide (CO2) and water (H2O) at standard conditions?

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

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What is the rate of diffusion of oxygen gas at 25°C and 1 atm pressure, if it diffuses through a platinum sheet with a thickness of 0.1 mm and a surface area of 10 cm²? The diffusion coefficient of oxygen in platinum is 2.2 x 10^-5 cm²/s.

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

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What is the bond strength of the nitrogen-hydrogen bond in ammonia (NH3) as compared to the nitrogen-hydrogen bond in hydrazine (N2H4)? Use electronegativity values and bond lengths to justify your answer.

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

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What is the mass of aluminum metal that can be deposited by passing a current of 5.0 A through an Al(NO3)3 solution for 45 minutes? (Assume 100% efficiency and a Faraday constant of 96,500 C/mol.)

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

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What is the Gibbs free energy change for the reaction of Zinc with Copper sulfate solution in which Zinc gets oxidized to Zinc sulfate and Copper ions get reduced to Copper metal, given the standard reduction potentials for each half-reaction?

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

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What is the yield of 2,4-dinitrophenylhydrazine obtained when using an excess of hydrazine to react with 1.00 g of 2,4-dinitrochlorobenzene under standard conditions?

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

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What is the yield of 2,4-dinitrobenzoic acid produced from the reaction of 10 grams of benzoic acid with excess nitric acid in the presence of sulfuric acid catalyst under reflux, if the experimental yield obtained was 7.5 grams?

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

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What is the standard molar entropy change (∆S°) for the reaction: 2HBr(g) + Cl2(g) -> 2HCl(g) + Br2(g) if the standard molar enthalpy change (∆H°) is -107.6 kJ/mol?

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

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How can we design a drug that specifically targets the bacterial cell wall synthesis of Staphylococcus aureus without affecting the human host cells?

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

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What is the pH of a 0.1 M solution of hydrochloric acid (HCl)?

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

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1 answer 101 views

Using Monte Carlo simulations, analyze the phase transition of water from a liquid to a gas at different pressures and temperatures and determine the critical point at which the two phases become indistinguishable.

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

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1 answer 93 views

What is the standard enthalpy change for the dissolution of 5.00 g of potassium chloride (KCl) in water, given that the molar heat of solution for KCl is -17.95 kJ/mol?

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

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What is the standard enthalpy change for the reaction of methane gas and oxygen gas to form carbon dioxide gas and water vapor, given that all gases are at standard temperature and pressure conditions?

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

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1 answer 93 views

What is the standard electrode potential for the reduction of Cu2+ to Cu at a temperature of 25°C? Use the half-reaction equation and the Nernst equation to calculate the potential.

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

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What is the percent yield of carbon dioxide if 25 grams of magnesium carbonate react with excess hydrochloric acid, and 7.5 grams of carbon dioxide are produced? The theoretical yield of carbon dioxide for this reaction is 10 grams.

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

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1 answer 89 views

How can we design a system that produces surfactants with high purity levels while minimizing waste generation and energy consumption?

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

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