Recent questions in Chemistry

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Calculate the bond dissociation energy (in kJ/mol) of the C-H bond in methane (CH4) using the following data: - The enthalpy change for the combustion of one mole of methane gas is -890.3 kJ/mol.- The energy required to break one mole of H-H bonds is 433.4 kJ/mol.- The energy required to break one mole of C=O bonds is 799.5 kJ/mol.- The energy required to break one mole of O-H bonds is 463.0 kJ/mol.

asked Jan 23 in ThermoChemistry by TravisJohnst (450 points)

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Calculate the bond dissociation energy (in kJ/mol) of the C-H bond in methane (CH4) using experimental data.

asked Jan 23 in ThermoChemistry by ZHWRonda6574 (450 points)

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Calculate the bond dissociation energy (in kJ/mol) of chlorine gas (Cl2) if it requires 243 kJ of energy to break a single Cl-Cl bond in the gas phase.

asked Jan 23 in ThermoChemistry by LouNeuhaus88 (200 points)

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Calculate the bond dissociation energy (in kJ/mol) for the O-H bond in water (H2O) given that the enthalpy change for the reaction H2O (g) → H (g) + OH(g) is +495 kJ/mol and the enthalpy change for the reaction H2(g) + 1/2O2(g) → H2O(g) is -241.8 kJ/mol.

asked Jan 23 in ThermoChemistry by VHBMorgan997 (510 points)

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Calculate the bond dissociation energy (in kJ/mol) for the carbon-hydrogen bond in methane (CH4) using the following information: - The enthalpy change for the reaction CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) is -890.3 kJ/mol. - The enthalpy change for the reaction 2H2(g) + O2(g) → 2H2O(g) is -484.2 kJ/mol.

asked Jan 23 in ThermoChemistry by KandiK082807 (310 points)

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Calculate the bond dissociation energy (in kJ/mol) for the breaking of the carbon-hydrogen (C-H) bond in methane (CH4), given the following information: CH4 (g) → CH3 (g) + H (g) ∆H = 432 kJ/mol Note: The bond dissociation energy is the amount of energy required to break a bond between two atoms in a molecule, resulting in two separate atoms.

asked Jan 23 in ThermoChemistry by TinaDiederic (390 points)

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Calculate the bond angles and molecular geometry of the methane (CH4) molecule by using quantum chemistry principles.

asked Jan 23 in Quantum Chemistry by GerardoGall2 (290 points)

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1 answer 51 views

Calculate the boiling point of sodium chloride using Raoult's law assuming that the vapor pressure of pure water at the given temperature is 25 Torr and the mole fraction of NaCl in the solution is 0.2.

asked Jan 23 in Inorganic Chemistry by FawnContrera (390 points)

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Calculate the boiling point of potassium chloride (KCl) using the Clausius-Clapeyron equation, given that its enthalpy of vaporization is 40.0 kJ/mol and its standard boiling point is 1500 K. What would be the expected boiling point of KCl at an atmospheric pressure of 1.0 atm (760 mmHg)?

asked Jan 23 in Inorganic Chemistry by RoryEggers98 (410 points)

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Calculate the binding energy of a hydrogen molecule and a helium atom in their ground state using Quantum chemical calculations of non-covalent interactions. What is the strength of the interaction between these two species?

asked Jan 23 in Computational Chemistry by KandyApplega (270 points)

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1 answer 47 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 MillieDalget (460 points)

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1 answer 37 views

Calculate the band gap and optical absorption spectrum of a graphene monolayer using quantum chemical calculations and compare it with that of a MoS2 monolayer. Which material would be more suitable for optoelectronic devices? Explain your reasoning.

asked Jan 23 in Quantum Chemistry by IsraelTaft4 (400 points)

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Calculate the average energy and specific heat capacity of a system containing 1000 molecules of an ideal gas at a temperature of 300 K, when the gas is subjected to an isochoric process and its volume remains constant at 2.5 L.

asked Jan 23 in Physical Chemistry by RayApplegate (290 points)

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1 answer 45 views

Calculate the area per molecule occupied by a monolayer of n-octadecane molecules adsorbed at the air-water interface assuming a surface pressure of 20 mN/m. The molecular weight of n-octadecane is 284.54 g/mol and its molecular area in the liquid phase is 0.219 nm². Use the Langmuir adsorption isotherm equation to solve the problem.

asked Jan 23 in Surface Chemistry by LouiePickett (330 points)

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Calculate the anodic Tafel slope for the following electrochemical reaction taking place at a platinum electrode:Fe2+(aq) + 2e- → Fe(s) Given that the exchange current density is 4.50 x 10^-4 A/cm^2 and the reaction rate constant for the reaction is 2.5 x 10^5 cm/s.

asked Jan 23 in ElectroChemistry by DonMccune367 (370 points)

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Calculate the anodic Tafel slope for an electrochemical cell in which the corrosion current density is 0.05 mA/cm² and the anodic overpotential is 50 mV. The exchange current density for the anodic reaction is 0.02 mA/cm².

asked Jan 23 in ElectroChemistry by DonnyBustama (310 points)

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1 answer 7 views

Calculate the anodic Tafel slope for a reaction with an exchange current density of 2x10^-4 A cm^-2 if the current density at an anodic potential of 0.1V vs the standard hydrogen electrode (SHE) is 0.5 mA cm^-2 and at 0.2V vs SHE is 2.0 mA cm^-2. Assume a linear relationship between current density and overpotential.

asked Jan 23 in ElectroChemistry by BillieLoughm (310 points)

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1 answer 52 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 Marquita53Q8 (430 points)

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1 answer 43 views

Calculate the amount of ozone depletion caused by the release of 1000 metric tons of chlorofluorocarbons (CFCs) into the atmosphere and explain the impact it can have on the atmosphere in terms of UV radiation and human health.

asked Jan 23 in Environmental Chemistry by MammieLayne (570 points)

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1 answer 55 views

Calculate the amount of heat that needs to be absorbed to crystallize 100 grams of sodium acetate (CH3COONa) from a saturated solution at 40°C. The heat of crystallization for sodium acetate is -264 kJ/mol.

asked Jan 23 in ThermoChemistry by BarrettVep43 (390 points)

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