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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 theoretical yield of nylon-6,6 that can be produced from the reaction of 10 grams of adipic acid and 10 grams of hexamethylenediamine, assuming no side reactions occur and all reactants are completely consumed?

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

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How can the synthesis process of nanoparticles be modified to achieve higher yields and better control of the particle size, shape and structure?

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

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What is the activation energy of the reaction between hydrochloric acid and zinc, given that the reaction rate constant at 25°C is 3.42 x 10^-3 s^-1 and the temperature coefficient is 1.99?

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

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What is the theoretical yield of acetylsalicylic acid that can be obtained if 5 grams of acetic anhydride and 3 grams of salicylic acid are reacted to synthesize acetylsalicylic acid, assuming complete conversion and 100% efficiency?

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

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What are the available techniques for assessing the compatibility of polymer blends and provide a critical evaluation of the strengths and limitations of each technique?

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

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What are the optimal reaction conditions for the synthesis of p-nitroaniline from aniline and nitric acid, and how can the purity of the final product be measured and improved?

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

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What would be the expected yield of nylon-6,6 if 5 grams of adipic acid were reacted with excess hexamethylenediamine in a 1:1 molar ratio reaction?

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

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What is the enthalpy change of combustion for the reaction of 0.5 moles of methane, CH4, at standard conditions?

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

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How can the use of different catalysts affect the yield and structure of carbon nanotubes synthesized through chemical vapor deposition?

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

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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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What is the theoretical yield of 2,4-dinitrobenzoic acid that can be obtained from the reaction between 5 grams of benzoic acid and an excess of nitric acid, assuming a 100% reaction efficiency?

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 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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How can we design a polymer-based sensor that accurately detects the presence of heavy metals in water samples?

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

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What is the density of sodium chloride (NaCl) at a temperature of 25°C and a pressure of 1 atm? (Given: molar mass of NaCl = 58.44 g/mol, crystal structure of NaCl = face-centered cubic, unit cell edge length = 5.64 Å).

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

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Using molecular orbital theory, calculate the bond order and predict the stability of nitrogen molecule (N2)?

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

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What is the yield of benzocaine that can be obtained from the reaction of 10 grams of p-aminobenzoic acid with excess ethanol, assuming a perfect reaction and no loss of product during workup?

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

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What is the surface area of a sample of activated charcoal if the BET plot data at a nitrogen pressure of 0.98 atm gives a monolayer capacity of 0.16 mol/g and the weight of the sample used is 0.25 g? (Assume the density of the charcoal to be 2.2 g/cm³)

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

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What is the standard enthalpy change for the reaction N2(g) + 3H2(g) → 2NH3(g) given the following standard enthalpies of formation: ΔHf°(N2)=0 kJ/mol, ΔHf°(H2)=0 kJ/mol, ΔHf°(NH3)=-46.2 kJ/mol? Make sure to show your calculations and units.

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

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