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Determine the HOMO and LUMO energies of the ethylene molecule using a molecular orbital calculation, and predict whether the molecule has any potential for conjugation.

asked 2 days ago in Quantum Chemistry by SusanBellew (510 points)

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Determine the heat of hydration, in kJ/mol, for the reaction between solid Calcium chloride (CaCl2) and water (H2O), given that 1 mole of CaCl2 dissolves to produce 3 moles of ions and releases -82.8 kJ of heat in the process.

asked 2 days ago in ThermoChemistry by ErnestoSprou (470 points)

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Determine the heat capacity of aluminum if 50.0 g of the metal is heated from 25°C to 75°C using 100.0 J of heat energy.

asked 2 days ago in Chemical thermodynamics by ChanteCamari (610 points)

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Determine the heat capacity of a 50-g sample of iron that is heated from 25°C to 100°C using 500 J of heat.

asked 2 days ago in Chemical thermodynamics by Julissa70G4 (430 points)

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1 answer 33 views

Determine the geometry and polarity of the ammonium ion (NH4+).

asked 2 days ago in Inorganic Chemistry by ValarieNewli (230 points)

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Determine the formal charge on the sulfur atom in sulfur hexafluoride (SF6)?

asked 2 days ago in Inorganic Chemistry by Devin51E645 (790 points)

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Determine the formal charge of the central atom in SF6. Show all your work and explain how you arrived at your answer.

asked 2 days ago in Inorganic Chemistry by Foster60490 (470 points)

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Determine the equilibrium constant, Kc, for the reaction between iodine and thiosulfate ions in aqueous solution, given the initial concentrations of iodine (0.02 M), thiosulfate (0.05 M), and hydrogen ions (0.1 M). The reaction is as follows:I2(aq) + 2S2O3^2-(aq) + 2H+(aq) ⇌ 2I^-(aq) + S4O6^2-(aq) Assume that the reaction takes place at 25°C and that the reaction quotient Qc has a value of 0.04 at equilibrium.

asked 2 days ago in Chemical equilibrium by KieraSeton95 (530 points)

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Determine the equilibrium constant, Kc, for the formation of the complex ion FeSCN2+ if 0.15 moles of Fe(NO3)3 and 0.25 moles of NaSCN are mixed in 1.0 L of water at 25°C and allowed to come to equilibrium. During the reaction, 0.05 moles of FeSCN2+ are formed.

asked 2 days ago in Chemical equilibrium by TravisJohnst (230 points)

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1 answer 23 views

Determine the equilibrium constant, Kc, for the following reaction: N2(g) + O2(g) ⇌ 2NO(g) If the initial concentration of N2 is 0.50 M, O2 is 0.40 M, and NO is 0.10 M at equilibrium, what is the value of Kc?

asked 2 days ago in Chemical equilibrium by ThaoCrews506 (210 points)

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Determine the equilibrium constant for the reaction of the complex ion formation between silver ion (Ag+) and ammonia (NH3) in a solution at 25°C, given that the concentration of Ag+ is 0.005 M and that of NH3 is 0.025 M. The balanced equation for the reaction is Ag+ + 2NH3 ⇋ [Ag(NH3)2]+.

asked 2 days ago in Chemical equilibrium by SerenaBeving (310 points)

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Determine the equilibrium constant for the following redox reaction taking place at 25°C: Fe2+(aq) + H2O2(aq) + 2H+(aq) → Fe3+(aq) + 2H2O(l) Given the standard reduction potentials below: Fe3+/Fe2+ = +0.771 V H2O2(aq)/H2O(l) = +1.78 V

asked 2 days ago in Chemical equilibrium by MartinCadwal (450 points)

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1 answer 24 views

Determine the equilibrium constant at room temperature for the reaction of hydrogen gas and iodine gas to form hydrogen iodide gas, if the initial concentrations of hydrogen and iodine gases were 0.50 M and 0.25 M, respectively, and the equilibrium concentration of hydrogen iodide gas is 0.40 M.

asked 2 days ago in Chemical equilibrium by JuliannLeSou (630 points)

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1 answer 35 views

Determine the equilibrium constant (Kc) for the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), given that at a certain temperature, the initial concentrations of SO2, O2, and SO3 were 0.10 M, 0.20 M, and 0.05 M, respectively, and the reaction was allowed to reach equilibrium.

asked 2 days ago in Chemical thermodynamics by NormandSwaff (290 points)

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Determine the equilibrium constant (Kc) for the reaction 2NO(g) + O2(g) ⇌ 2NO2(g) if the initial concentration of NO is 0.15 M, O2 is 0.10 M and NO2 is 0.30 M at equilibrium.

asked 2 days ago in Chemical reactions by LeonardoHyla (710 points)

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Determine the equilibrium constant (Kc) for the following reaction at a temperature of 298 K if the concentrations of reactants and products are [CO] = 0.10 M, [H2] = 0.20 M, and [CH3OH] = 0.05 M:CO(g) + 2H2(g) ↔ CH3OH(g)

asked 2 days ago in Physical Chemistry by MicahReidy99 (550 points)

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Determine the equilibrium constant (Kc) for the chemical reaction: 2 SO2(g) + O2(g) ⇌ 2 SO3(g)Given that at a certain temperature, the concentrations of SO2, O2, and SO3 are 0.25 M, 0.15 M, and 0.40 M, respectively, at equilibrium.

asked 2 days ago in Chemical thermodynamics by HSRZak712052 (690 points)

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Determine the equilibrium concentrations of reactants and products for the reaction 2H2(g) + O2(g) ⇌ 2H2O(g) at 500K when initial concentrations of H2 and O2 are 0.2M and 0.1M respectively, and the equilibrium constant (Kc) is 4.67 x 10^3.

asked 2 days ago in Chemical equilibrium by JoycelynBras (330 points)

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Determine the entropy change for the combustion of methane gas (CH4) at constant pressure and 298 K. Given the standard molar entropy values are: S°(CH4) = 186 J/mol.K, S°(O2) = 205 J/mol.K, S°(CO2) = 214 J/mol.K and S°(H2O) = 188 J/mol.K.

asked 2 days ago in Chemical thermodynamics by BobbyeY74750 (410 points)

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Determine the enthalpy of hydrolysis for sodium acetate (NaC2H3O2) given that the enthalpy of neutralization for acetic acid (HC2H3O2) and sodium hydroxide (NaOH) is -55.9 kJ/mol and the heat of formation for NaC2H3O2 is -382.7 kJ/mol.

asked 2 days ago in ThermoChemistry by OliverY88898 (370 points)

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