Hot questions

0 votes

1 answer 112 views

A student is given a galvanic cell that has a copper electrode and a silver electrode. The concentration of copper ions in the solution surrounding the copper electrode is 1.0 M, and the silver electrode is submerged in a solution of AgNO3 with a concentration of 0.1 M. The cell temperature is 25°C. Calculate the resistance of the electrochemical cell given that the cell is at equilibrium and the cell potential is measured to be 0.46 volts.

asked Jan 22 in ElectroChemistry by Lowell36338 (1.9k points)

0 votes

1 answer 79 views

Calculate the corrosion current density of a steel metal in contact with a copper metal, given that the corrosion potential of steel and copper are -0.58 V and +0.34 V, respectively. The temperature and pH of the solution are 25°C and 7, respectively. The surface area of the steel metal is 10 cm2 and the copper metal is a large area electrode.

asked Jan 23 in ElectroChemistry by DannieGuf001 (2.3k points)

0 votes

1 answer 111 views

A student needs to find out how much heat is released or absorbed when 100 mL of 0.1 mol/L solution of barium chloride (BaCl2) is mixed with 150 mL of 0.1 mol/L solution of sodium sulfate (Na2SO4) at 25°C. Given the enthalpy of precipitation of BaSO4 as -256 kJ/mol, calculate the enthalpy change (in kJ) for the reaction that occurs and determine whether the reaction is exothermic or endothermic.

asked Jan 22 in ThermoChemistry by BrainRubin29 (2.2k points)

0 votes

1 answer 81 views

Calculate the band gap energy (in eV) of a crystal using density functional theory calculations. Given the crystal's lattice parameters and the positions of its atoms, determine its electronic properties and predict whether it is likely to be an insulator, semiconductor, or conductor.

asked Jan 23 in Computational Chemistry by VirgilioAbe5 (1.9k points)

0 votes

1 answer 73 views

Calculate the enthalpy of adsorption when 2.0 grams of activated charcoal adsorbs 25 mL of methane gas at a constant temperature of 298 K, given that the pressure is 1 atm. Assume ideal gas behavior for methane.

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

0 votes

1 answer 74 views

Calculate the enthalpy change of combustion for the reaction of methane (CH4) when 1.25 moles of methane is completely burnt in excess oxygen gas at standard conditions, given that the enthalpy change of combustion for methane is -890.3 kJ/mol.

asked Jan 23 in ThermoChemistry by HiramFarrell (1.7k points)

0 votes

1 answer 81 views

Calculate the anodic Tafel slope for the following electrochemical reaction taking place at a platinum electrode:Fe2+(aq) + 2e- → Fe(s) Given that the exchange current density is 4.50 x 10^-4 A/cm^2 and the reaction rate constant for the reaction is 2.5 x 10^5 cm/s.

asked Jan 23 in ElectroChemistry by DeanI7567799 (2.2k points)

0 votes

1 answer 71 views

Calculate the enthalpy of isomerization for the reaction of cis-2-butene to its trans counterpart. Given the following information: - Heat of combustion of cis-2-butene = -3338.9 kJ/mol- Heat of combustion of trans-2-butene = -3478.6 kJ/mol- Heat of combustion of butane = -2877.2 kJ/mol

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

0 votes

1 answer 64 views

Calculate the heat of hydration of 1 mole of anhydrous copper(II) sulfate (CuSO4) when it is dissolved in water to form its hydrated form, CuSO4·5H2O. Given the following information:- Heat of solution of anhydrous CuSO4: -74.9 kJ/mol- Enthalpy change of hydration of CuSO4·5H2O: -245.1 kJ/mol

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

0 votes

1 answer 65 views

Calculate the Gibbs free energy change for the chemical reaction: 2H2O (l) → 2H2 (g) + O2 (g)at a temperature of 298 K, given that the standard Gibbs free energies of formation are ΔGf°(H2O) = -237.13 kJ/mol, ΔGf°(H2) = 0 kJ/mol, and ΔGf°(O2) = 0 kJ/mol.

asked Jan 23 in Chemical thermodynamics by ShaunteYun90 (1.4k points)

0 votes

1 answer 80 views

Calculate the bond length between a carbon and a hydrogen atom in methane (CH4), given that the bond energy is 104.2 kcal/mol and the force constant is 500 N/m.

asked Jan 23 in Chemical bonding by Linnea35385 (2.0k points)

0 votes

1 answer 75 views

Calculate the enthalpy change for the fusion of 50.0 g of ice at its melting point (0 °C). The molar enthalpy of fusion of water is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by EttaRide758 (1.3k points)

0 votes

1 answer 79 views

Calculate the change in entropy (in J/K) for the following reaction at 298 K: 2CH3OH (l) + 3O2 (g) → 2CO2 (g) + 4H2O (l) Given the following standard entropy values (in J/K): CH3OH (l): 126.6, O2 (g): 205.0, CO2 (g): 213.6, H2O (l): 69.9

asked Jan 23 in Chemical thermodynamics by RondaSkeyhil (1.7k points)

0 votes

1 answer 66 views

Calculate the equilibrium constant (Kc) at 25°C for the following redox reaction involving a weak oxidizing agent: H2O2(aq) + 2I^-(aq) + 2H^+(aq) ⇌ I2(aq) + 2H2O(l)

asked Jan 23 in Chemical equilibrium by AhmadEho9450 (1.6k points)

0 votes

1 answer 80 views

Calculate the bond energy for the O-H bond in a water molecule (H2O), given that the enthalpy change for the combustion of 1 mole of water is -286 kJ/mol and the O=O bond energy is 498 kJ/mol.

asked Jan 23 in Chemical reactions by HughNewquist (2.3k points)

0 votes

1 answer 119 views

A chemistry student needs to calculate the standard enthalpy change for the combustion reaction of methane gas (CH4) at 298 K and 1 atm pressure. The equation for the reaction is:CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l)Given the following standard enthalpies of formation at 298 K:ΔHf(CO2) = -393.5 kJ/molΔHf(H2O) = -285.8 kJ/molΔHf(CH4) = -74.8 kJ/molCalculate ΔHrxn, the standard enthalpy change for the combustion reaction of methane gas.

asked Jan 22 in Chemical thermodynamics by SelmaHartsoc (1.8k points)

0 votes

1 answer 74 views

Calculate the enthalpy change for the process of desorption of carbon dioxide from a zeolite adsorbent at a temperature of 298 K, given that the heat of adsorption for carbon dioxide on the same zeolite at the same temperature is -40 kJ/mol.

asked Jan 23 in ThermoChemistry by GarnetFjo447 (1.8k points)

0 votes

1 answer 119 views

A chemistry student needs to calculate the rate constant for the following reaction: 2 H2(g) + O2(g) --> 2 H2O(g) The initial concentration of H2 is 0.45 M and the initial concentration of O2 is 0.20 M. The reaction rate is measured to be 0.75 M/s. Calculate the rate constant for the reaction.

asked Jan 22 in Chemical kinetics by 43025337997 (2.2k points)

0 votes

1 answer 125 views

A chemical engineering company has a mixture of ethanol and water with a concentration of 30% ethanol to separate using a distillation column. The company needs to obtain a concentration of 80% ethanol in the distillate at a reflux ratio of 3. Calculate the number of theoretical plates required in the column for the separation, assuming no vapor or liquid bypass, and that the minimum vapor velocity is maintained.

asked Jan 22 in Chemical engineering by DarbyJackey7 (1.4k points)

0 votes

1 answer 82 views

Calculate the amount of heat energy needed to melt a 25-g ice cube at its melting point of 0°C. The enthalpy of fusion of water is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by NelleVxq8414 (1.5k points)

Categories