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How does thermal analysis (TA) help in the analysis and characterization of polymers? Provide a detailed explanation of the various TA techniques and their applications in polymer chemistry.

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

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The problem is:What is the standard enthalpy change for the dissolution of 5.00 grams of solid magnesium chloride (MgCl2) in 250.0 mL of water at 25 ℃? Given the molar enthalpy of hydration of MgCl2 is -641 kJ/mol.

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

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What is the percentage yield of aspirin obtained from the synthesis of aspirin using 5 grams of salicylic acid and excess acetic anhydride?

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

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What is the percent yield of silver chloride when 24.5 g of silver nitrate solution reacts with excess sodium chloride to form 23.1 g of silver chloride? The balanced chemical equation is: AgNO3 + NaCl → AgCl + NaNO3.

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

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What is the standard enthalpy change for the following reaction, where 2 moles of solid iron (Fe) reacts with 1 mole of oxygen gas (O2) to produce 2 moles of solid iron (III) oxide (Fe2O3)? 4Fe(s) + 3O2(g) -> 2Fe2O3(s)

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

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What is the standard enthalpy change (ΔH°) for the reaction of 1 mole of liquid ethanol (C2H5OH) and 1 mole of liquid oxygen (O2) to produce 2 moles of gaseous carbon dioxide (CO2) and 3 moles of liquid water (H2O)?

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

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What is the percent yield of p-nitroaniline obtained when 10g of aniline is reacted with excess nitric acid to produce p-nitroaniline and 8g of the product is obtained after purification?

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

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What is the change in entropy (ΔS) when 1 mole of hydrogen gas (H2) reacts with 1 mole of chlorine gas (Cl2) to form 2 moles of hydrogen chloride gas (2HCl) at a temperature of 298 K and a pressure of 1 atm?

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

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How can we design a system for the production of hydrogen fuel that minimizes the use of non-renewable resources and reduces environmental impact?

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

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How can we design a system for the production of hydrogen fuel that maximizes efficiency and minimizes cost using chemical engineering principles?

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

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What is the minimum amount of energy required to break H2O molecules in a system consisting of 100 water molecules at a temperature of 298 K? Use statistical mechanics and thermodynamic ensembles to solve the problem.

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

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What is the surface area of a sample of activated carbon if 10 mL of nitrogen gas (at a temperature of 25°C and a pressure of 1 atm) is adsorbed onto 0.1 g of the carbon with a monolayer capacity of 0.5 mL/g?

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

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What is the Gibbs free energy change (ΔG) for the reaction NH3(g) + HCl(g) → NH4Cl(s) at standard conditions (298 K and 1 atm)? Show the steps taken to calculate ΔG using quantum chemistry calculations.

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

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What are the differences between Thermogravimetry Analysis (TGA) and Differential Scanning Calorimetry (DSC) in terms of their principles, advantages, and applications in polymer characterization?

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

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What is the standard free energy change for the following redox reaction at 25°C?2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) + Sn4+(aq) Given: E°(Fe3+/Fe2+) = 0.771 V E°(Sn4+/Sn2+) = 0.150 V R = 8.314 J/K•mol F = 96,485 C/mol

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

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What is the standard enthalpy of formation of methane (CH4) given the following bond dissociation energies (in kJ/mol): C-H = 413, C-C = 348, C=C = 614, C≡C = 837, H-H = 436?

asked Mar 1 in ThermoChemistry 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 heat of sublimation of carbon dioxide (CO2) if 50 g solid CO2 is completely converted into gas phase without changing the temperature and pressure conditions? Given: The molar heat of sublimation of CO2 is 25.2 kJ/mol.

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

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How can we design a system using chemical principles to efficiently recover valuable metals such as gold, silver, and platinum from electronic waste without causing harm to the environment?

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

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What is the specific surface area of a sample of activated carbon if it adsorbs 0.45 g of nitrogen gas at 77 K and a pressure of 1 atm, assuming a monolayer of adsorbate and that the nitrogen gas occupies a volume of 22.4 L/mol?

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

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