Answers by TheScientist

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

answered Mar 1 in Chemical reactions

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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)?

answered Mar 1 in Chemical reactions

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24 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.

answered Mar 1 in Chemical reactions

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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?

answered Mar 1 in Chemical reactions

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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.

answered Mar 1 in Chemical bonding

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45 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?

answered Mar 1 in ThermoChemistry

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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.

answered Mar 1 in Chemical bonding

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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?

answered Mar 1 in Surface Chemistry

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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?

answered Mar 1 in Surface Chemistry

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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.

answered Mar 1 in Quantum Chemistry

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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.

answered Mar 1 in ElectroChemistry

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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.

answered Mar 1 in ElectroChemistry

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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.

answered Mar 1 in ElectroChemistry

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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?

answered Mar 1 in ThermoChemistry

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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?

answered Mar 1 in ThermoChemistry

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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.

answered Mar 1 in Physical Chemistry

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46 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.

answered Mar 1 in ThermoChemistry

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31 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.

answered Mar 1 in ThermoChemistry

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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?

answered Mar 1 in ThermoChemistry

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31 views

What is the amount of heat released when burning 5.00 grams of methane (CH4) in excess oxygen under standard conditions?

answered Mar 1 in Physical Chemistry

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