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Calculate the rate of the electrochemical reaction when a current of 2.5 A is passed through a solution of copper sulphate for 2 hours, and 4 g of copper is formed at the cathode. The atomic weight of copper is 63.5 g/mol.

asked Feb 3 in ElectroChemistry by AngleaLeroy5 (450 points)

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Calculate the standard enthalpy change for the precipitation reaction: AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)given that the standard enthalpy of formation for AgCl(s) is -127.0 kJ/mol, and for NaNO3(aq) is -467.14 kJ/mol. The molar enthalpy of solution of NaCl and AgNO3 are -3.9 kJ/mol and -19.9 kJ/mol respectively.

asked Feb 3 in Chemical thermodynamics by FrancesAtkin (410 points)

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How does changing the pH of a solution affect the equilibrium position of a weak acid-base reaction? Provide an example to support your answer.

asked Feb 3 in Chemical equilibrium by EliseLink178 (410 points)

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How does changing the size of a quantum dot affect its electronic and optical properties, and how can this information be applied to the design of novel nano-scale electronic devices?

asked Feb 3 in Quantum Chemistry by Grant0188167 (790 points)

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Calculate the standard enthalpy change for the formation of one mole of methane (CH4) gas given the following information: - Heat of combustion of methane gas is -890.36 kJ/mol - Heat of formation of water (H2O) liquid is -285.83 kJ/mol - Heat of formation of carbon dioxide (CO2) gas is -393.52 kJ/mol

asked Feb 3 in Chemical thermodynamics by Viola390266 (290 points)

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Calculate the power output of a galvanic cell having a standard potential of +0.76V and a current of 0.5A flowing through it. The cell consists of a zinc electrode and a copper electrode connected by a salt bridge and the concentration of the electrolyte is 1.0M. Given that the Faraday constant is 96487 C/mol and the temperature is 298K.

asked Feb 3 in ElectroChemistry by ClariceMcQui (190 points)

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What is the effect of changing the size and shape of quantum dots and quantum wells on their electronic and optical properties, and how can these changes be calculated using quantum chemistry methods?

asked Feb 3 in Quantum Chemistry by JerilynCarte (350 points)

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Calculate the standard enthalpy change for the formation of carbon dioxide (CO2) from its elements carbon (C) and oxygen (O2) given the following information:- The standard enthalpy change for the combustion of carbon to form carbon dioxide is -394 kJ/mol.- The standard enthalpy change for the combustion of hydrogen gas (H2) to form water (H2O) is -286 kJ/mol.- The standard enthalpy change for the reaction of oxygen gas (O2) with hydrogen gas (H2) to form water (H2O) is -572 kJ/mol.Note: All values are at standard temperature and pressure (298 K and 1 atm).

asked Feb 3 in Chemical thermodynamics by BirgitBrassa (330 points)

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Calculate the standard enthalpy change of the reaction between 100.0 mL of 0.100 M HCl(aq) and 100.0 mL of 0.100 M NaOH(aq) at 25°C, given that the specific heat capacity of the final solution is 4.18 J/g·°C and that the density of the final solution is 1.00 g/mL.

asked Feb 3 in Chemical thermodynamics by CathrynShiel (310 points)

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Calculate the standard free energy change for the following redox reaction at 25°C:2Fe(s) + 3/2 O2(g) -> Fe2O3(s)Given the following half-reactions and their standard reduction potentials at 25°C:Fe2O3(s) + 3H2O(l) + 2e- -> 2Fe(OH)3(s) E°= -0.33VO2(g) + 4H+(aq) + 4e- -> 2H2O(l) E°= +1.23VFe(OH)3(s) -> Fe3+(aq) + 3OH-(aq) E°= -0.25V

asked Feb 3 in Chemical thermodynamics by LeomaMcGuiga (490 points)

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Calculate the polarization in an electrochemical cell consisting of a zinc electrode and a copper electrode. The electrode potentials of zinc and copper are -0.76 V and +0.34 V, respectively. The resistance of the electrolyte solution between the electrodes is 10 ohms, and the current flowing through the cell is 0.5 A.

asked Feb 3 in ElectroChemistry by AlphonsoRidd (370 points)

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Calculate the pH of a 0.1 M solution of hydrochloric acid assuming complete dissociation. The acid dissociation constant (Ka) for HCl is 1.3 × 10^-6 at 25°C.

asked Feb 3 in Chemical reactions by Julissa70G4 (350 points)

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Calculate the standard enthalpy change for the following reaction at 298 K using the standard enthalpies of formation:2SO2(g) + O2(g) → 2SO3(g)

asked Feb 3 in Chemical thermodynamics by LovieDunross (370 points)

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How does changing the concentration of one reactant affect the reaction rate and reaction order in a chemical reaction with multiple reactants?

asked Feb 3 in Chemical kinetics by HeribertoPlo (370 points)

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Calculate the standard enthalpy change for the vaporization reaction of 25.0 g of water at its boiling point of 100°C using the following information: the molar heat of vaporization of water is 40.7 kJ/mol and the molar mass of water is 18.015 g/mol.

asked Feb 3 in Chemical thermodynamics by EzequielKrug (210 points)

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1 answer 25 views

Calculate the standard enthalpy of precipitation for the reaction: AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq) given that the standard enthalpies of formation for AgNO3(aq), NaCl(aq), AgCl(s), and NaNO3(aq) are -123.2 kJ/mol, -407.3 kJ/mol, -127.0 kJ/mol, and -467.3 kJ/mol, respectively.

asked Feb 3 in ThermoChemistry by Perry2210206 (330 points)

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1 answer 28 views

Calculate the standard enthalpy change for the neutralization reaction between 50.0 mL of 0.100 M hydrochloric acid and 75.0 mL of 0.080 M sodium hydroxide. Given: the specific heat capacity of the solution is 4.18 J/g°C and the density of the solution is 1.00 g/mL. The balanced chemical equation for the reaction is HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l).

asked Feb 3 in Chemical thermodynamics by EllieFitzwat (530 points)

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Calculate the standard enthalpy change for the dissolution of 5.36 g of NaOH in 100.0 mL of water, given that the molar enthalpy of dissolution for NaOH is -44.5 kJ/mol.

asked Feb 3 in Chemical thermodynamics by HildredCampo (730 points)

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Calculate the standard enthalpy change for the reaction in which 50 mL of 1.0 M HCl(aq) is added to 50 mL of 1.0 M NaOH(aq) at 25°C, given that the solution's specific heat capacity is 4.18 J g⁻¹ K⁻¹ and the density is 1.00 g/mL.

asked Feb 3 in Chemical thermodynamics by FrancescaShe (270 points)

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1 answer 36 views

How does changing the temperature affect the conformational properties and behavior of a polymer chain in a Monte Carlo simulation?

asked Feb 3 in Computational Chemistry by VHBMorgan997 (450 points)

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