Recent questions in Chemistry

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1 answer 64 views

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

asked Jan 23 in Quantum Chemistry by Daniel21219 (250 points)

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1 answer 64 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 SantiagoHein (350 points)

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1 answer 57 views

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 Michele43T64 (350 points)

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1 answer 74 views

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 SherrylR3277 (290 points)

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1 answer 65 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 TeraLtn99797 (450 points)

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1 answer 38 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 AntonyRcg890 (450 points)

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1 answer 64 views

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 LorenzoSuggs (390 points)

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1 answer 54 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 DarinLaidlaw (310 points)

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1 answer 59 views

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 AlycePulley2 (500 points)

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1 answer 58 views

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 MarlaGrimm6 (250 points)

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1 answer 9 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 HelenPidgeon (410 points)

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1 answer 64 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 RositaCoats (530 points)

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1 answer 52 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 LoydMyrick87 (520 points)

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1 answer 57 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 SilviaBack08 (450 points)

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1 answer 62 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 CortezDale67 (290 points)

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1 answer 47 views

Calculate the amount of heat required to sublimate 10 grams of dry ice (solid carbon dioxide) at a temperature of -78.5°C. The heat of sublimation of carbon dioxide is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by MariHeney752 (370 points)

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1 answer 65 views

Calculate the amount of heat required to raise the temperature of 50 grams of water from 25°C to 85°C, given the specific heat of water is 4.184 J/g°C.

asked Jan 23 in ThermoChemistry by TiaPritt9171 (370 points)

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1 answer 76 views

Calculate the amount of heat required to raise the temperature of 50 g of water from 25°C to 100°C, given the specific heat capacity of water is 4.18 J/g°C.

asked Jan 23 in Chemical thermodynamics by ClaritaCress (390 points)

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1 answer 50 views

Calculate the amount of heat required to polymerize 2 moles of styrene into polystyrene given the following information:The enthalpy of polymerization for styrene is -56 kJ/mol and the reaction is exothermic.

asked Jan 23 in ThermoChemistry by RobbinTerril (290 points)

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1 answer 51 views

Calculate the amount of heat required to melt 50 grams of ice at 0°C, given that the enthalpy of fusion of ice is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by DaniHatmaker (210 points)

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