Hot questions

0 votes

1 answer 60 views

Calculate the electronic and optical properties such as bandgap energy, Exciton binding energy, and absorption coefficient of a CdSe quantum dot having a diameter of 3.5 nm using Density Functional Theory.

asked Jan 23 in Quantum Chemistry by OmerFinsch09 (2.1k points)

0 votes

1 answer 61 views

Calculate the change in Gibbs free energy for the electrochemical reaction, given the standard reduction potentials of the reactants and products:Cu2+ (aq) + 2e- → Cu (s)E° = +0.34 VFe2+ (aq) + 2e- → Fe (s)E° = -0.44 V

asked Jan 23 in ElectroChemistry by WilburnMcCor (1.8k points)

0 votes

1 answer 62 views

Calculate the bond length between two carbon atoms in a molecule of ethene, assuming a carbon-carbon bond order of 1.5. (Hint: Use the empirical formula for calculating bond length: bond length = sum of covalent radii of the two atoms)

asked Jan 23 in Chemical bonding by StephaniaTkt (1.8k points)

0 votes

1 answer 64 views

Calculate the amount of heat required to sublime 50 grams of dry ice (CO2) at -78.5°C given that the heat of sublimation for CO2 is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by JonasHaller8 (1.5k points)

0 votes

1 answer 60 views

Calculate the electronegativity difference between a hydrogen atom (H) and a chlorine atom (Cl) in the molecule HCl.

asked Jan 23 in Chemical bonding by MorrisMcGahe (1.7k points)

0 votes

1 answer 57 views

Calculate the enthalpy change for the fusion of 50.0 g of ice at its melting point (0 °C). The molar enthalpy of fusion of water is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by EttaRide758 (1.3k points)

0 votes

1 answer 57 views

Calculate the enthalpy change for the following reaction using Hess's Law: 2SO3(g) → 2SO2(g) + O2(g)Given the following enthalpy changes:2SO3(g) + ΔH1 → 2SO2(g) + O2(g); ΔH1 = 198.2 kJ/molSO2(g) + 1/2O2(g) + ΔH2 → SO3(g); ΔH2 = -98.9 kJ/mol

asked Jan 23 in Chemical reactions by CarmaC633252 (1.7k points)

0 votes

1 answer 90 views

A student received a sample of an unknown substance weighing 5 grams. After performing a series of measurements, they found that the sample contained 2.5 grams of pure calcium carbonate and an unknown amount of impurities. Using mass balance calculations, determine the weight and composition of the impurities in the sample.

asked Jan 22 in Analytical Chemistry by jozzaumnvuiyulg (2.5k points)

0 votes

1 answer 47 views

Calculate the formal charge on the sulfur atom in the compound SO₃²⁻.

asked Jan 23 in Inorganic Chemistry by VirgilioAbe5 (1.9k points)

0 votes

1 answer 61 views

Calculate the change in enthalpy (ΔH) for the combustion of 10 grams of propane (C3H8) if the heat released by the reaction is -2202 kJ.

asked Jan 23 in Chemical reactions by AdelineBurro (1.9k points)

0 votes

1 answer 62 views

Calculate the bond energy for the O-H bond in a water molecule (H2O), given that the enthalpy change for the combustion of 1 mole of water is -286 kJ/mol and the O=O bond energy is 498 kJ/mol.

asked Jan 23 in Chemical reactions by HughNewquist (2.3k points)

0 votes

1 answer 56 views

Calculate the enthalpy change for the precipitation reaction that occurs when 50.0 mL of 0.100 M AgNO3 (aq) and 25.0 mL of 0.100 M NaCl (aq) are mixed together. The final temperature of the solution is 25.0°C, and the initial temperature of both solutions was 25.0°C. The heat capacity of the solution is 4.18 J/(g °C) and the density of each solution is 1.00 g/mL. Assume that the reaction goes to completion and that the density and specific heat capacity of the resulting solution are the same as those of pure water.

asked Jan 23 in ThermoChemistry by WilburnMcCor (1.8k points)

0 votes

1 answer 61 views

Calculate the cell potential for the following electrochemical reaction:Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)Given that the standard reduction potentials for the half-reactions are as follows:Zn2+(aq) + 2e- → Zn(s) E° = -0.76 VCu2+(aq) + 2e- → Cu(s) E° = +0.34 V

asked Jan 23 in ElectroChemistry by TobiasTudawa (1.9k points)

0 votes

1 answer 47 views

Calculate the formal charge of nitrogen in the nitrogen dioxide (NO2) molecule.

asked Jan 23 in Inorganic Chemistry by AubreyWoore (2.4k points)

0 votes

1 answer 55 views

Calculate the enthalpy change of the polymerization reaction of ethylene, given that the enthalpy of combustion of ethylene is -1411.1 kJ/mol and that the polymerization of ethylene releases 3.4 kJ/mol.

asked Jan 23 in ThermoChemistry by HalinaAlderm (1.9k points)

0 votes

1 answer 57 views

Calculate the enthalpy change for the dissolution of 10 g of NaOH in 100 mL of water at 25°C. The molar heat of dissolution of NaOH is -44.51 kJ/mol.

asked Jan 23 in ThermoChemistry by LouiePartrid (1.8k points)

0 votes

1 answer 60 views

Calculate the corrosion potential of iron in an acidic environment with a pH of 3.5, given that the half-reaction for the reduction of Fe3+ to Fe2+ is Fe3+ + e- → Fe2+ and the standard reduction potential (E°) for this half-reaction is +0.771 V.

asked Jan 23 in ElectroChemistry by AnjaAbt20068 (2.0k points)

0 votes

1 answer 62 views

Calculate the bond dissociation energy for the single bond in methane (CH4) given the following data: ΔHºf(CH4) = -74.8 kJ/molΔHºrxn = -890.4 kJ/mol Note: The bond dissociation energy is the amount of energy needed to break a bond between two atoms in a molecule, while keeping the other bonds intact.

asked Jan 23 in ThermoChemistry by JulianKnetes (2.0k points)

0 votes

1 answer 64 views

Calculate the amount of heat absorbed by 50 grams of water during the process of crystallization when it is cooled from 70°C to 0°C and solidifies into ice with a heat of crystallization of 333.55 J/g.

asked Jan 23 in ThermoChemistry by AguedaD83620 (2.6k points)

0 votes

1 answer 60 views

Calculate the corrosion potential of iron (Fe) in a 0.1 M HCl solution at 25°C, given that the standard electrode potential for the Fe2+/Fe redox couple is -0.44 V and the standard hydrogen electrode potential at the same temperature and pressure is 0 V. What is the likelihood of iron corrosion in this environment?

asked Jan 23 in ElectroChemistry by NicholeBueno (1.8k points)

Categories