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How can we analyze the molecular structure and behavior of liquid crystals to enhance the performance and efficiency of display technology?

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

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How can we reduce the environmental impact of industrial waste disposal techniques used by chemical manufacturing plants in order to ensure the safety of the surrounding ecosystems and communities?

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

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What is the enthalpy of formation of ammonia gas (NH3) at 298 K and 1 atm pressure using the given bond energies: N≡N = 418 kJ/mol, H-H = 436 kJ/mol, and N-H = 391 kJ/mol?

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

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What is the formal charge on the central atom (in brackets) in SO3²⁻? Calculate the formal charge on sulfur (S) and explain whether the molecule is overall neutral or has a charge.

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

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What is the formal charge of the sulfur atom in SO4^2- ion?

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

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What is the percent yield of 4-bromoacetanilide if 5.0 grams of acetanilide is reacted with excess bromine, and the actual yield of 4-bromoacetanilide obtained in the experiment is 4.2 grams?

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

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What is the standard enthalpy change for the vaporization of 50 grams of water at 100°C and 1 atm pressure? Given the molar enthalpy of vaporization of water is 40.7 kJ/mol.

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

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What is the standard enthalpy change for the vaporization of 50 grams of liquid water at 100°C and 1 atm pressure? Given that the molar enthalpy of vaporization of water is 40.6 kJ/mol.

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

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What is the change in internal energy of a system when two moles of hydrogen gas react with one mole of oxygen gas to form two moles of water vapor at constant temperature and pressure?

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

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What is the optimum amount of hexamethylenediamine to be used in the synthesis of nylon-6,6 from adipic acid to get maximum yield?

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

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How can we effectively remove persistent organic pollutants (POPs) from contaminated soil and water sources for the purpose of environmental cleanup and protection?

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

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What is the value of the reaction quotient Q for the following chemical reaction at a temperature of 25°C, given the concentrations of reactants and products: 2H2(g) + O2(g) → 2H2O(g) [H2] = 0.25 M [O2] = 0.15 M [H2O] = 0.20 M

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

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What is the enthalpy change of precipitation when 50 mL of 0.1 M BaCl2 is mixed with 25 mL of 0.2 M Na2SO4, given that ΔH˚f of BaSO4 is -1464 kJ/mol?

asked Mar 1 in ThermoChemistry 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 molar mass of ammonium sulfate ((NH4)2SO4)? Round your answer to the nearest hundredth of a gram.

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

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What is the heat of formation (in kJ/mol) of methane (CH4) from its elements carbon (C) and hydrogen (H2) at standard conditions (25°C and 1 atm)? Use the following data for the bond energies: C-H = 414 kJ/mol, H-H = 436 kJ/mol, and C-C = 348 kJ/mol.

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

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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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How does the Wagner-Meerwein rearrangement occur and what are its key characteristics? Explain with the help of a specific example from organic chemistry.

asked Feb 28 in Organic Chemistry by TheScientist (138k points)

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How does the use of different exchange-correlation functionals in density functional theory calculations affect the calculated reaction energies and mechanisms for the catalytic oxidation of methane on transition metal surfaces?

asked Feb 28 in Computational Chemistry by TheScientist (138k points)

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What is the maximum yield of benzocaine that can be obtained from the reaction between p-aminobenzoic acid and ethanol, assuming 100% conversion of the reactants and a starting mass of 5 grams of p-aminobenzoic acid with excess ethanol?

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

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