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Calculate the weight-average molecular weight of a polymer sample with the following information:- The polydispersity index (PDI) of the sample is 1.5.- The number-average molecular weight (Mn) of the sample is 20,000 g/mol. - The weight fraction (w) of the polymer with a molecular weight of 30,000 g/mol is 0.2, and the weight fraction of the polymer with a molecular weight of 10,000 g/mol is 0.8.

asked Feb 3 in Physical Chemistry by RobertoLafla (2.1k points)

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1 answer 77 views

Calculate the wavelength of light that must be absorbed for an electron in a hydrogen atom to transition from the n=3 to n=2 energy level, using the equation for energy of a hydrogen atom: E = -13.6/n^2 eV and the Planck constant, h = 6.626 × 10^-34 J s.

asked Feb 3 in Quantum Chemistry by CorneliusMen (2.2k points)

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Calculate the volume of 0.2 M hydrochloric acid required to completely neutralize 25 mL of 0.1 M sodium hydroxide solution.

asked Feb 3 in Chemical reactions by EloiseLoxton (1.7k points)

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Calculate the vibrational frequencies and predict the infrared spectrum of methane (CH4) using quantum chemical methods.

asked Feb 3 in Quantum Chemistry by CandelariaFe (1.6k points)

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1 answer 46 views

Calculate the vibrational frequencies and infrared spectra for a molecule of carbon dioxide (CO2) using quantum chemistry methods.

asked Feb 3 in Quantum Chemistry by NorineFelici (1.8k points)

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1 answer 86 views

Calculate the vibrational frequencies and corresponding infrared spectra of HF molecule using quantum mechanical methods.

asked Feb 3 in Quantum Chemistry by Agustin3989 (1.7k points)

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1 answer 58 views

Calculate the vibrational frequencies and corresponding infrared spectra of carbon dioxide gas (CO2) using quantum chemical methods.

asked Feb 3 in Quantum Chemistry by WUWTaylor875 (1.7k points)

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1 answer 56 views

Calculate the value of standard enthalpy change for the sublimation of solid iodine at 25°C. The molar heat capacity of iodine (s) is 54.44 J/mol·K and its molar entropy of sublimation is 62.43 J/mol·K. The standard entropy of formation of iodine (s) is 62.80 J/mol·K.

asked Feb 3 in Chemical thermodynamics by MoniqueBrins (1.9k points)

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1 answer 64 views

Calculate the total resistance of an electrochemical cell consisting of two half-cells where one half-cell has a copper electrode submerged in a 0.5 M CuSO4 solution, and the other half-cell has a zinc electrode submerged in a 1.0 M ZnSO4 solution. The copper electrode is connected to the zinc electrode through a salt bridge. The resistance of the salt bridge is 22 ohms, and the resistance of the copper and zinc electrodes are negligible.

asked Feb 3 in ElectroChemistry by CharmainRose (2.2k points)

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1 answer 69 views

Calculate the total heat change when 100 ml of 0.5 M HCl is mixed with 100 ml of 0.5 M NaOH at 25°C. Assume the heat capacity of the solution is 4.18 J/(g°C) and the density of the solution is 1 g/mL. The enthalpy of neutralization of HCl and NaOH is -57.3 kJ/mol.

asked Feb 3 in ThermoChemistry by ChasityLearm (2.1k points)

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1 answer 63 views

Calculate the theoretical yield of benzocaine that can be produced from 1.5 moles of p-aminobenzoic acid and excess ethanol, assuming complete conversion and a 95% yield.

asked Feb 3 in Chemical synthesis by BradCoz53277 (1.9k points)

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1 answer 52 views

Calculate the surface tension of water at a temperature of 25°C using the capillary rise method, given that the diameter of the capillary tube is 0.8 mm and the rise of water in the tube is 3 cm.

asked Feb 3 in Surface Chemistry by HenryCharles (2.0k points)

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1 answer 44 views

Calculate the surface tension of a liquid whose weight is 0.1 N and the length of a wire that floats on the surface of the liquid is 20 cm. The density of the liquid is 1.2 g/cm³.

asked Feb 3 in Surface Chemistry by MaribelLeepe (1.7k points)

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1 answer 75 views

Calculate the surface area of a solid adsorbent material using BET theory, given that the mass of the adsorbent material is 2.5 g, the area occupied by each adsorbed layer is 15 Å², the number of monolayers formed is 4, and the value of the BET constant is 0.05.

asked Feb 3 in Surface Chemistry by VioletteM27 (2.1k points)

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1 answer 39 views

Calculate the standard reaction entropy of the reaction: 2Fe(s) + 3/2O2(g) --> Fe2O3(s) given that the standard enthalpy of the reaction is -824.2 kJ/mol at 298K.

asked Feb 3 in Inorganic Chemistry by JuanitaPiess (2.1k points)

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1 answer 51 views

Calculate the standard potential of the cell Ag(s) | Ag+(aq, 0.0100 M) || Cu2+(aq, 1.00 M) | Cu(s) at 25°C.

asked Feb 3 in ElectroChemistry by StanGjo3033 (1.9k points)

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1 answer 53 views

Calculate the standard potential of a Daniell cell if the concentration of copper ions and zinc ions in their respective half-cells is 1.0 M and the temperature of the cell is 25°C. The standard reduction potentials of copper and zinc electrodes are +0.34 V and -0.76 V respectively.

asked Feb 3 in Physical Chemistry by KristeenN708 (2.1k points)

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1 answer 69 views

Calculate the standard molar entropy change for the reaction: 2 SO2(g) + O2(g) → 2 SO3(g) at 298 K, given the following standard molar entropies: ΔS°(SO2(g)) = 248.2 J K^-1 mol^-1 ΔS°(O2(g)) = 205.0 J K^-1 mol^-1 ΔS°(SO3(g)) = 256.2 J K^-1 mol^-1

asked Feb 3 in Quantum Chemistry by WilburnMcCor (1.8k points)

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1 answer 70 views

Calculate the standard molar entropy change (∆S°) at 298 K for the reaction: 2H2 (g) + O2 (g) → 2H2O (l) given that the standard molar enthalpy change (∆H°) for this reaction is -572 kJ/mol.

asked Feb 3 in Quantum Chemistry by MaryellenGra (2.1k points)

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1 answer 62 views

Calculate the standard molar enthalpy change for the following reaction using quantum chemistry and compare it with the literature value: 2H2(g) + O2(g) -> 2H2O(g) Literature Value: -572 kJ/mol

asked Feb 3 in Quantum Chemistry by KrystleFarth (1.7k points)

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