Recent questions

0 votes

1 answer 60 views

Calculate the enthalpy change (ΔH) for the isomerization of butene-1 to butene-2, given that the heat of combustion of butene-1 and butene-2 are -2657.7 kJ/mol and -2674.4 kJ/mol, respectively.

asked Jan 23 in ThermoChemistry by LeifLeverett (2.3k points)

0 votes

1 answer 53 views

Calculate the enthalpy change (ΔH) for the following reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)using the following bond enthalpies (in kJ/mol):NH3(g): N-H = 391, N ≡ N = 941O2(g): O=O = 498NO(g): N=O = 628H2O(g): O-H = 463

asked Jan 23 in Inorganic Chemistry by MarkusPaquet (1.7k points)

0 votes

1 answer 58 views

Calculate the enthalpy change (ΔH) for the dissolution of 10 grams of NaOH in 100 mL of water, given that the final temperature after mixing is 28°C and the initial temperature of water was 25°C. The specific heat capacity of water is 4.18 J/g°C. The molar mass of NaOH is 40.00 g/mol and the enthalpy of dissolution for NaOH is -44.51 kJ/mol.

asked Jan 23 in ThermoChemistry by LouellaKinar (2.0k points)

0 votes

1 answer 58 views

Calculate the enthalpy change (in kJ/mol) for the polymerization of ethylene to polyethylene, given that the polymerization of 1 mole of ethylene produces 3 moles of polyethylene and the enthalpy change of the reaction is -32 kJ/mol.

asked Jan 23 in ThermoChemistry by MaybellHoffm (2.2k points)

0 votes

1 answer 50 views

Calculate the enthalpy change (in kJ/mol) for the isomerization reaction of butene-1 to butene-2. Given the standard enthalpy of formation values for butene-1 as -126.3 kJ/mol and butene-2 as -126.0 kJ/mol, and the heat of combustion values for butene-1 as -2670.0 kJ/mol and butene-2 as -2666.0 kJ/mol.

asked Jan 23 in ThermoChemistry by DanieleLane (1.6k points)

0 votes

1 answer 63 views

Calculate the enthalpy change (in kJ/mol) for the ionization of sulfuric acid (H2SO4) given the following information: H2SO4 (l) → H+ (aq) + HSO4- (aq)ΔH1 = +1009 kJ/molHSO4- (aq) → H+ (aq) + SO4^2- (aq)ΔH2 = +513 kJ/mol.

asked Jan 23 in ThermoChemistry by LinetteWaldo (1.6k points)

0 votes

1 answer 60 views

Calculate the enthalpy change (in kJ/mol) for the ionization of magnesium, given that the first ionization energy of magnesium is 738 kJ/mol and the second ionization energy is 1450 kJ/mol.

asked Jan 23 in ThermoChemistry by RamiroShockl (2.3k points)

0 votes

1 answer 60 views

Calculate the enthalpy change (in kJ/mol) for the chemical reaction: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) Given the standard enthalpies of formation (ΔHf°) for C2H5OH(l) = -277.6 kJ/mol, CO2(g) = -393.5 kJ/mol, and H2O(l) = -285.8 kJ/mol.

asked Jan 23 in Chemical thermodynamics by JodieBaskett (1.8k points)

0 votes

1 answer 43 views

Calculate the enthalpy change (in kJ/mol) for dissolving 10 grams of NaOH in 100 mL of water at 25°C, given that the molar heat of solution for NaOH is -444.6 kJ/mol.

asked Jan 23 in ThermoChemistry by RandolphWvo (1.9k points)

0 votes

1 answer 62 views

Calculate the enthalpy change (∆H) for the combustion reaction of methane gas (CH4) using Hess’s Law, when the enthalpy changes for the following reactions are given: Reaction 1: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l); ∆H = -891 kJ/mol Reaction 2: C (s) + O2 (g) → CO2 (g); ∆H = -393.5 kJ/mol Reaction 3: 2H2 (g) + O2 (g) → 2H2O (l); ∆H = -484 kJ/mol

asked Jan 23 in ThermoChemistry by SueCasteel38 (1.4k points)

0 votes

1 answer 52 views

Calculate the energy required to break all the bonds in 1 mole of methane gas (CH4) at standard conditions, given that the bond energies of C-H and C-C bonds are 413 kJ/mol and 348 kJ/mol, respectively. Then, calculate the total energy released or absorbed during the combustion of 1 mole of methane gas with oxygen gas to form carbon dioxide gas and water vapor.

asked Jan 23 in Chemical reactions by MindyR870320 (1.6k points)

0 votes

1 answer 48 views

Calculate the energy required to break a carbon-carbon single bond (C-C) with a bond length of 1.54 Å using the average bond-dissociation energy of 347 kJ/mol for this type of bond.

asked Jan 23 in Chemical reactions by ElidaHaskins (1.7k points)

0 votes

1 answer 64 views

Calculate the electronic energy levels and absorption spectra of a quantum dot composed of CdSe with a diameter of 5 nanometers and compare it to a quantum well with the same dimensions. Which structure would have a higher bandgap energy and why?

asked Jan 23 in Quantum Chemistry by JosetteSarto (2.0k points)

0 votes

1 answer 60 views

Calculate the electronic and optical properties such as bandgap energy, Exciton binding energy, and absorption coefficient of a CdSe quantum dot having a diameter of 3.5 nm using Density Functional Theory.

asked Jan 23 in Quantum Chemistry by OmerFinsch09 (2.1k points)

0 votes

1 answer 55 views

Calculate the electronegativity difference between hydrogen (electronegativity of 2.20) and chlorine (electronegativity of 3.16) and determine the type of bond formed between them according to the electronegativity difference classification.

asked Jan 23 in Chemical bonding by KrystleFarth (1.7k points)

0 votes

1 answer 58 views

Calculate the electronegativity difference between chlorine (Cl) and sodium (Na) atoms, and determine the type of bond that would form between them.

asked Jan 23 in Chemical bonding by KristeenBras (2.0k points)

0 votes

1 answer 59 views

Calculate the electronegativity difference between carbon and hydrogen in a methane (CH4) molecule using the Pauling scale of electronegativity.

asked Jan 23 in Chemical bonding by FerneSparks (2.3k points)

0 votes

1 answer 64 views

Calculate the electronegativity difference between carbon and hydrogen atoms in methane (CH4). Show the steps involved in the calculation and explain what the value of the electronegativity difference indicates about the bonding between the atoms.

asked Jan 23 in Chemical bonding by LaureneMcAle (1.8k points)

0 votes

1 answer 60 views

Calculate the electronegativity difference between a hydrogen atom (H) and a chlorine atom (Cl) in the molecule HCl.

asked Jan 23 in Chemical bonding by MorrisMcGahe (1.7k points)

0 votes

1 answer 67 views

Calculate the electrical double layer thickness of a silica particle with a radius of 50 nm, assuming the particle is in water at room temperature and has a surface charge density of -0.05 C/m².

asked Jan 23 in Physical Chemistry by AstridMusser (1.9k points)

Categories