Recent questions in Chemistry

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What is the enthalpy of formation of water (H2O) from its elements hydrogen and oxygen at standard conditions (25°C and 1 atm)?

asked Feb 20 in ThermoChemistry by Shelia708886 (2.1k points)

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1 answer 36 views

What is the enthalpy of formation of magnesium oxide (MgO) given the enthalpy of formation of magnesium (Mg) is -601 kJ/mol and the enthalpy of formation of oxygen (O2) is 0 kJ/mol?

asked Feb 20 in ThermoChemistry by IsobelMaggar (1.8k points)

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1 answer 39 views

What is the enthalpy of formation of carbon dioxide (CO2) if the enthalpies of formation for carbon (C) and oxygen (O2) are -94 kJ/mol and 0 kJ/mol, respectively?

asked Feb 20 in ThermoChemistry by RamiroShockl (2.3k points)

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1 answer 37 views

What is the enthalpy of combustion of ethanol (C2H5OH) if the standard enthalpy change of combustion of ethanol is -1367 kJ/mol and the heat of formation of water (H2O) is -285.8 kJ/mol?

asked Feb 20 in ThermoChemistry by TatianaSteil (2.3k points)

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What is the enthalpy change of ionization of magnesium if 125 kJ of energy is required to completely remove one electron from a magnesium atom?

asked Feb 20 in ThermoChemistry by KyleWaddy213 (1.9k points)

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What is the enthalpy change of ionization for magnesium (Mg) given that it requires 738 kJ/mol to remove the first electron and 1450 kJ/mol to remove the second electron from a Mg atom?

asked Feb 20 in ThermoChemistry by LatashaWillc (2.7k points)

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1 answer 42 views

What is the enthalpy change of adsorption when 10 grams of activated charcoal absorb 1 mole of methane gas at a temperature of 298 K? Given that the van't Hoff factor for the adsorption of methane on activated charcoal is 10.5 kJ/mol.

asked Feb 20 in ThermoChemistry by HoraceT7712 (2.0k points)

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1 answer 35 views

What is the enthalpy change for the ionization of one mole of magnesium in the gas phase, given that the ionization energy of magnesium is 738 kJ/mol and the electron affinity of magnesium is -50.1 kJ/mol? Show your work and include units in your answer.

asked Feb 20 in ThermoChemistry by AnibalX1615 (2.1k points)

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1 answer 34 views

What is the enthalpy change for the ionization of lithium with a first ionization energy of 520 kJ/mol?

asked Feb 20 in ThermoChemistry by DarbyKieran3 (2.0k points)

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1 answer 35 views

What is the enthalpy change for the ionization of hydrogen atoms in the gas phase, given that the ionization energy of a hydrogen atom is 1312 kJ/mol?

asked Feb 20 in ThermoChemistry by MargueriteSa (2.1k points)

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1 answer 39 views

What is the enthalpy change (in kJ/mol) for the combustion of propane (C3H8) using Hess's Law? Use the following information: C3H8 + 5O2 → 3CO2 + 4H2O ∆H = −2043 kJ/mol 2CO + O2 → 2CO2 ∆H = −566 kJ/mol H2 + 1/2O2 → H2O ∆H = −285.8 kJ/mol

asked Feb 20 in ThermoChemistry by EffieQkd6688 (1.7k points)

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1 answer 33 views

What is the enthalpy change (in kJ/mol) for the combustion of methane, CH4(g), given the following thermochemical equation:CH4(g) + 2 O2(g) -> CO2(g) + 2 H2O(l)ΔHrxn = -890.3 kJ/mol

asked Feb 20 in ThermoChemistry by KelleS495456 (1.9k points)

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1 answer 38 views

How does the type and size of nanomaterials affect the enhancement factor in Surface-enhanced Raman spectroscopy (SERS)?

asked Feb 20 in Surface Chemistry by CIGArmando01 (1.8k points)

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1 answer 45 views

How does the energy transfer process between molecules affect the molecular dynamics of a chemical reaction? Provide a detailed analysis using quantum chemistry principles.

asked Feb 20 in Quantum Chemistry by DanieleLane (1.6k points)

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How does the energy state of an electron affect the rate of electron transfer in redox reactions?

asked Feb 20 in Quantum Chemistry by MichaelBirds (2.0k points)

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1 answer 36 views

What is the energy required to break the bond between two oxygen atoms in a molecule of O2, given that the bond energy of an O-O bond is 498 kJ/mol?

asked Feb 20 in Chemical reactions by Danny16L1758 (1.6k points)

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1 answer 32 views

What is the amount of energy required to break the single C-H bond in the methane (CH4) molecule? Provide the answer in units of kilojoules per mole (kJ/mol).

asked Feb 20 in Chemical reactions by StefanHartin (1.7k points)

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1 answer 38 views

How much energy is required to activate a chemical reaction with a rate constant of 2.5x10^-3 s^-1 if the activation energy is 50 kJ/mol?

asked Feb 20 in Chemical reactions by YukikoDalgle (1.6k points)

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1 answer 38 views

How does the energy profile of an excited state of a molecule differ from its ground state, and how can we predict the transitions between them using quantum chemical calculations?

asked Feb 20 in Computational Chemistry by ZellaSeamon3 (1.6k points)

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1 answer 26 views

How does the energy of the transition state affect the rate of an enzyme-catalyzed reaction, and how can this information be useful for predicting reaction rates and mechanisms in biochemical processes?

asked Feb 20 in Quantum Chemistry by AlineBentham (2.1k points)

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