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What is the theoretical yield of nylon-6,6 that can be produced from the reaction of 25 grams of adipic acid and 35 grams of hexamethylenediamine? (Assuming 100% reaction efficiency)

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

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How can we create a smart material using polymers that can detect toxins in water and turn a visibly different color to indicate contamination?

asked Mar 1 in Polymer Chemistry 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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What is the change in enthalpy for the following reaction at room temperature: 2H2(g) + O2(g) -> 2H2O(l) given the bond dissociation energies: H-H: 436 kJ/mol O=O: 498 kJ/mol H-O: 463 kJ/mol

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

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How does the use of different polymer electrolytes affect the performance of solid-state lithium-ion batteries?

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

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What is the heat of hydration for MgSO4·7H2O, given that its enthalpy change per mole of hydration is -192 kJ/mol and 10 grams of MgSO4·7H2O is dissolved in 100 grams of water at 25°C?

asked Mar 1 in ThermoChemistry 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 rate of diffusion of oxygen in the air at standard temperature and pressure when the molecular weight of oxygen is 32 g/mol and the diffusion coefficient is 0.188 cm^2/s?

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

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What surface modification techniques can be used to enhance the catalytic activity of nanoparticles for specific chemical reactions?

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

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What is the power output (in Watts) of an electrochemical cell at standard conditions, given that the cell potential is 1.5V and the total resistance of the circuit is 10 ohms?

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

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What is the standard enthalpy change for the reaction of gaseous hydrogen and gaseous iodine to form hydrogen iodide at standard temperature and pressure? Show all steps of calculation using Hess's Law and relevant thermochemical equations.

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

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What is the pH of a solution that has a hydrogen ion concentration of 2.5 x 10^-7 M? Determine the pH using a pH meter and state whether the solution is acidic, neutral, or basic based on the calculated pH value.

asked Mar 1 in Analytical 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 Gibbs free energy change at 298 K for the reaction A + 2B → 2C if the standard Gibbs free energy of formation for A, B, and C are 100 kJ/mol, -50 kJ/mol, and -120 kJ/mol, respectively?

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

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What is the standard free energy change (ΔG°) for the following redox reaction at 298 K?2Fe2+ (aq) + Cl2 (g) → 2Fe3+ (aq) + 2Cl- (aq)Given data:E°(Fe3+|Fe2+) = +0.77 V; E°(Cl2|Cl-) = +1.36 V

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

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What is the wavenumber (cm^-1) of the fundamental vibrational mode of carbon dioxide using Fourier transform infrared spectroscopy?

asked Mar 1 in Physical Chemistry 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 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 enthalpy change when 1.50 moles of methane (CH4) is burned in excess oxygen gas (O2) under standard conditions, if the combustion reaction releases 890.4 kJ of heat? (Assuming all reactants and products are in their standard states)

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

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What is the formal charge on the oxygen atom in the sulfate ion (SO4 2-)? Show your calculation and explain how you arrived at your answer based on the shared and unshared electrons in the molecule.

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

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