Recent questions in Chemistry

0 votes

1 answer 30 views

Sure, here's a question for you to solve:Calculate the bond energy required to break the H-O bond in water (H2O). Given that the bond energy of the H-H bond is 436 kJ/mol and O=O bond is 495 kJ/mol.

asked Mar 1 in Chemical reactions by TheScientist (138k points)

0 votes

1 answer 32 views

What is the bond energy required to break the bond between two nitrogen atoms (N2) if the bond length is 109.76 pm?

asked Mar 1 in Chemical reactions by TheScientist (138k points)

0 votes

1 answer 33 views

What is the bond energy (in kJ/mol) required to break apart a single molecule of methane (CH4) into its individual atoms (C and 4H)?

asked Mar 1 in Chemical reactions by TheScientist (138k points)

0 votes

1 answer 23 views

What is the bond energy of O-H bond in the water molecule (H2O)? Show the complete calculation with the given bond dissociation energy of H-O bond and H-H bond.

asked Mar 1 in Chemical reactions by TheScientist (138k points)

0 votes

1 answer 35 views

What is the bond energy (in kJ/mol) of the covalent bond between the carbon and oxygen atoms in carbon dioxide (CO2), given that the bond length is 116.3 pm?

asked Mar 1 in Chemical reactions by TheScientist (138k points)

0 votes

1 answer 37 views

What is the bond dissociation energy of the O-H bond in a water molecule? Use the given data: the enthalpy change for the reaction H2(g) + 1/2O2(g) --> H2O(l) is -285.8 kJ/mol and the average bond energy of an O-H bond is 463 kJ/mol.

asked Mar 1 in Chemical bonding by TheScientist (138k points)

0 votes

1 answer 44 views

What is the bond dissociation energy of the carbon-hydrogen bond in methane (CH4) when using experimental data from a combustion reaction that indicates the combustion of 1 mole of methane releases 890.4 kJ of heat?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

0 votes

1 answer 36 views

Using the bond dissociation energy values for H-H, Cl-Cl, and H-Cl given in a table, calculate the bond dissociation energy for the HCl molecule.

asked Mar 1 in Chemical bonding by TheScientist (138k points)

0 votes

1 answer 34 views

What is the BET surface area of a sample of carbon adsorbent that adsorbed 7.2 mmol of nitrogen gas at a liquid nitrogen temperature of 77 K, assuming a monolayer coverage of 5.8 x 10^-7 mol/m2 and a nitrogen pressure of 0.98 atm?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

0 votes

1 answer 27 views

What is the BET surface area of activated carbon with a monolayer capacity of 25 mg/g and a multilayer capacity of 90 mg/g, given that the weight of the activated carbon used for the experiment was 5 g?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

0 votes

1 answer 34 views

What is the bandgap energy of a CdSe/ZnS core/shell quantum dot with a radius of 2.5 nm? Use the effective mass approximation to calculate the confinement energies. Also, calculate the Bohr radius and compare it to the size of the quantum dot.

asked Mar 1 in Quantum Chemistry by TheScientist (138k points)

0 votes

1 answer 36 views

What is the anodic Tafel slope for the oxidation of Fe in a 0.1 M FeCl2 solution at a current density of 0.5 mA/cm2? Use the given data: T = 298 K, A = 0.2 cm2, and the exchange current density is 0.1 mA/cm2.

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

0 votes

1 answer 30 views

What is the anodic Tafel slope for the oxidation of iron in a solution with a pH of 3? Given that the corrosion current density is 2.5 x 10^-6 A/cm2 and the overpotential is 0.2 V.

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

0 votes

1 answer 34 views

What is the anodic Tafel slope for the oxidation of zinc in a solution of 0.5 M NaCl at 25°C with a current density of 5 mA/cm2? The exchange current density value for the reaction is 2.5 x 10^-6 A/cm2.

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

0 votes

1 answer 41 views

Sure, here's a precise question:Calculate the amount of heat required to vaporize 50 g of water at its boiling point (100°C) if its enthalpy of vaporization is 40.7 kJ/mol?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

0 votes

1 answer 34 views

What is the amount of heat required to completely vaporize 200 g of water at its boiling point of 100°C, given that the enthalpy of vaporization of water is 40.7 kJ/mol?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

0 votes

1 answer 30 views

What is the amount of heat (in joules) required to raise the temperature of 125 grams of water from 25°C to its boiling point of 100°C? The specific heat capacity of water is 4.184 J/(g·°C) and the enthalpy of vaporization of water is 40.7 kJ/mol.

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

0 votes

1 answer 45 views

What is the amount of heat required to melt 25 g of ice at 0°C? The enthalpy of fusion of ice is 333 J/g.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

0 votes

1 answer 30 views

Question: The heat of sublimation of iodine is 62.44 kJ/mol. Calculate the amount of heat required for subliming 20 g of iodine at its melting point of 387 K.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

0 votes

1 answer 40 views

What is the amount of heat released when 2.5 grams of ethanol (C2H5OH) burns completely in excess oxygen, given that the heat of combustion of ethanol is -1371 kJ/mol and the molar mass of ethanol is 46.07 g/mol?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

Categories