Hot questions

0 votes

1 answer 50 views

Calculate the lattice energy of magnesium oxide (MgO) given that the lattice enthalpy of magnesium (Mg) is 3944 kJ/mol and that of oxygen (O) is 751 kJ/mol.

asked Jan 23 in Inorganic Chemistry by MalcolmUribe (2.0k points)

0 votes

1 answer 65 views

Calculate the density of barium sulfate ($\text{BaSO}_{4}$) with a molecular weight of 233.39 g/mol, assuming a sample with a mass of 5 g occupies a volume of 3 mL.

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

0 votes

1 answer 69 views

Calculate the amount of heat released when 10.0 g of methane gas (CH4) is burned in excess oxygen at constant pressure, given that the enthalpy of combustion of methane is -890.3 kJ/mol.

asked Jan 23 in Physical Chemistry by MarcyVallejo (2.2k points)

0 votes

1 answer 62 views

Calculate the enthalpy change for the following chemical reaction: 2NH3(g) + 3O2(g) → 2NO(g) + 3H2O(l) Given the following enthalpy values: ΔH°f (NH3) = −46.11 kJ/molΔH°f (O2) = 0 kJ/molΔH°f (NO) = 90.3 kJ/molΔH°f (H2O) = −285.8 kJ/mol

asked Jan 23 in Chemical thermodynamics by ShavonneSalc (1.8k points)

0 votes

1 answer 62 views

Calculate the enthalpy change for the dissolution of 5.00 g of sodium hydroxide (NaOH) in 100.0 g of water (H2O). The temperature change was measured to be -3.45°C. Given that the specific heat of water is 4.18 J/g°C and the density of water is 1.00 g/mL. (Assume that the heat evolved from NaOH is absorbed by the water.)

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

0 votes

1 answer 67 views

Calculate the bond dissociation energy of the O-H bond in a water molecule if the enthalpy change for the following reaction is -285.8 kJ/mol:2H2(g) + O2(g) -> 2H2O(l)

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

0 votes

1 answer 53 views

Calculate the equilibrium constant (K$\textsubscript{a}$) for the reaction of acetic acid in aqueous solution if the pH of the solution is 4.76 and the concentration of acetic acid is 0.1 M.

asked Jan 23 in Chemical equilibrium by ElidaHaskins (1.7k points)

0 votes

1 answer 67 views

Calculate the bond dissociation energy of a molecule of hydrogen (H₂) given that the bond length is 74 pm and the energy required to break the bond is 436 kJ/mol.

asked Jan 23 in Chemical bonding by AveryJoris20 (2.0k points)

0 votes

1 answer 65 views

Calculate the corrosion potential of copper in seawater environment having a pH of 8.2 and a temperature of 25°C given that the standard hydrogen electrode potential is -0.76 V and the concentration of copper ions in seawater is 2.5 x 10^-5 M.

asked Jan 23 in ElectroChemistry by JoelPrentice (1.4k points)

0 votes

1 answer 67 views

Calculate the bond dissociation energy for the H-H bond in a diatomic hydrogen molecule, given that the enthalpy change for the reaction H2(g) → 2 H(g) is 436 kJ/mol.

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

0 votes

1 answer 64 views

Calculate the enthalpy change for the combustion of 2 moles of methane gas (CH4) at constant pressure, given that the standard enthalpy of formation (ΔHf) of methane gas is -74.8 kJ/mol. Express your answer in kilojoules (kJ).

asked Jan 23 in Chemical thermodynamics by NadiaN491716 (2.1k points)

0 votes

1 answer 52 views

Calculate the exchange current density for the redox reaction: Fe2+ + Cr2O72- + 14H+ → 2Fe3+ + 2Cr3+ + 7H2O Given that the standard potential for the reaction at 25°C is 1.33 V, the gas constant is 8.314 J/mol K, and the temperature is 298 K.

asked Jan 23 in ElectroChemistry by DarbyJackey7 (1.4k points)

0 votes

1 answer 66 views

Calculate the bond order and bond length of the nitrogen-oxygen bond in the nitrate ion (NO3-).

asked Jan 23 in Inorganic Chemistry by AmyNowland4 (2.5k points)

0 votes

1 answer 61 views

Calculate the enthalpy change for the isomerization of butene to isobutene given that the enthalpy of combustion for butene is -2671.2 kJ/mol and the enthalpy of combustion for isobutene is -2678.6 kJ/mol. Assume that the molar enthalpy of formation of CO2 and H2O are -393.5 kJ/mol and -241.8 kJ/mol, respectively.

asked Jan 23 in ThermoChemistry by GustavoPonti (1.6k points)

0 votes

1 answer 51 views

Calculate the heat capacity of 50 grams of pure water at 25°C, given that the specific heat capacity of water is 4.184 J/g°C.

asked Jan 23 in Chemical thermodynamics by SusannahCrow (2.4k points)

0 votes

1 answer 67 views

Calculate the band gap energy (in eV) of a crystal using density functional theory calculations. Given the crystal's lattice parameters and the positions of its atoms, determine its electronic properties and predict whether it is likely to be an insulator, semiconductor, or conductor.

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

0 votes

1 answer 65 views

Calculate the corrosion current density (in mA/cm²) of a silver electrode in a galvanic couple with a standard hydrogen electrode if the measured potential of the silver electrode is -0.25 V versus the standard hydrogen electrode at a temperature of 25 °C. The Tafel slope of the silver electrode is 30 mV/decade and the corrosion potential of silver in the given environment is -0.15 V.

asked Jan 23 in ElectroChemistry by AgustinSteed (2.2k points)

0 votes

1 answer 52 views

Calculate the equilibrium constant for the electrochemical cell reaction given below, if the standard reduction potential for the reduction of Fe3+ ion is -0.771 V and for the reduction of Ag+ ion is +0.799 V. Fe3+ + 3e- → Fe (s) E° = -0.771 VAg+ + e- → Ag (s) E° = +0.799 V

asked Jan 23 in ElectroChemistry by JonasOql0066 (1.5k points)

0 votes

1 answer 64 views

Calculate the electronic energy levels and absorption spectra of a quantum dot composed of CdSe with a diameter of 5 nanometers and compare it to a quantum well with the same dimensions. Which structure would have a higher bandgap energy and why?

asked Jan 23 in Quantum Chemistry by JosetteSarto (2.0k points)

0 votes

1 answer 67 views

Calculate the anodic Tafel slope (in mV/decade) for the corrosion of iron in a solution containing 0.1 M HCl, given that the corrosion current density is 2.5 mA/cm2 and the exchange current density is 0.25 mA/cm2. Assume T = 25°C and the activation energy of the reaction is 40 kJ/mol.

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

Categories