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Calculate the bond dissociation energy for the H-H bond in a diatomic hydrogen molecule, given that the enthalpy change for the reaction H2(g) → 2 H(g) is 436 kJ/mol.

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

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1 answer 82 views

Calculate the amount of heat (in joules) released when 50 ml of 0.1 M hydrochloric acid (HCl) is mixed with 50 ml of 0.1 M sodium hydroxide (NaOH) at a constant pressure and a temperature of 25°C. The heat of neutralization of HCl and NaOH is -57.1 kJ/mol.

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

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1 answer 111 views

A student is studying the kinetics of a reaction between hydrogen and iodine gases. They measure the initial rate of the reaction to be 0.025 mol L^-1 s^-1 at a particular temperature. They want to calculate the rate constant for this reaction using this information. What is the rate constant of this reaction at this temperature?

asked Jan 22 in Chemical kinetics by LeannaCremea (1.6k points)

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1 answer 77 views

Calculate the enthalpy change for the combustion of 5.67 grams of methane (CH4) if the standard enthalpy of combustion of methane is -890.4 kJ/mol.

asked Jan 23 in Chemical reactions by CorneliusMen (2.2k points)

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1 answer 114 views

A chemistry student wants to study the adsorption of nitrogen gas on a copper surface at 298 K. The student knows that the Langmuir adsorption isotherm can be used to describe this system. They want to determine the maximum amount of nitrogen gas that can be adsorbed on the copper surface and the adsorption energy of nitrogen to the copper surface. Can you help the student to calculate these values using the Langmuir adsorption isotherm equation?

asked Jan 22 in Surface Chemistry by ColumbusU230 (2.4k points)

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1 answer 65 views

Calculate the exchange current density for the redox reaction: Fe2+ + Cr2O72- + 14H+ → 2Fe3+ + 2Cr3+ + 7H2O Given that the standard potential for the reaction at 25°C is 1.33 V, the gas constant is 8.314 J/mol K, and the temperature is 298 K.

asked Jan 23 in ElectroChemistry by DarbyJackey7 (1.4k points)

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1 answer 73 views

Calculate the enthalpy change of mixing 50 mL of 1 M HCl with 50 mL of 1 M NaOH at 25°C. It is known that the standard enthalpies of formation of HCl and NaOH are -92.3 kJ/mol and -469.2 kJ/mol, respectively. Assume that the heat capacity of the mixture is 4.18 J/g°C and the density of the solution is 1 g/mL.

asked Jan 23 in ThermoChemistry by AubreyWoore (2.4k points)

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1 answer 74 views

Calculate the enthalpy change for the isomerization of butene-1 to butene-2 given that the heat of combustion of butene-1 and butene-2 are -2874 kJ/mol and -2854 kJ/mol respectively. Assume all reactants and products are in the gaseous state and that the reaction is carried out at constant pressure.

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

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1 answer 65 views

Calculate the equilibrium constant, Kc, for the reaction below at 25°C if the concentration of CO2 is 1.2 M, the concentration of H2 is 0.8 M and the concentration of CO is 0.6 M.CO2(g) + H2(g) ⇌ CO(g) + H2O(g)

asked Jan 23 in Chemical equilibrium by JanieCorso7 (1.9k points)

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1 answer 78 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)

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1 answer 110 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)

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1 answer 72 views

Calculate the enthalpy of combustion for sucrose (C₁₂H₂₂O₁₁) given that 5.25 g of sucrose were burned in a bomb calorimeter and the temperature rose by 2.75 °C. The heat capacity of the calorimeter is 20.45 kJ/°C.

asked Jan 23 in ThermoChemistry by IWHJaxon1452 (2.1k points)

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1 answer 73 views

Calculate the enthalpy change of dissolution (in kJ/mol) for NaCl in water, given that 1.00 g of NaCl is dissolved in 50.0 mL of water at 25°C. The density of water is 0.997 g/mL and the specific heat capacity of the solution is assumed to be the same as that of water (4.184 J/gK). The molar mass of NaCl is 58.44 g/mol.

asked Jan 23 in ThermoChemistry by LorenzaOrell (2.1k points)

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1 answer 110 views

A student needs to determine the enthalpy change (ΔH) for the reaction between ammonium nitrate (NH4NO3) and water (H2O) using Hess's Law calculations. Given the following information: - ΔHf° (NH4NO3) = -365.4 kJ/mol- ΔHf° (HNO3) = -207.3 kJ/mol- ΔHf° (NH4+) = -132.5 kJ/mol- ΔHf° (NO3-) = -206.1 kJ/mol- ΔHf° (H2O) = -285.83 kJ/molFormulate the thermochemical equation for the reaction by using the given data and Hess's Law calculations, and then calculate the enthalpy change for the reaction.

asked Jan 22 in ThermoChemistry by LeannaCremea (1.6k points)

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1 answer 72 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)

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1 answer 65 views

Calculate the equilibrium constant for a reaction involving a weak oxidizing agent where the concentration of the oxidizing agent is 0.1 M and the concentration of the reduced species is 0.05 M at equilibrium. The balanced chemical equation of the reaction is given as follows:OX + 2 e- ⇌ REDwhere OX is the weak oxidizing agent and RED is the reduced species.

asked Jan 23 in Chemical equilibrium by LeesaJ55672 (1.9k points)

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1 answer 79 views

Calculate the bond length between two carbon atoms in ethene (C2H4), given that the distance between the nuclei of the carbon atoms is 1.33 angstroms and the bond angle between them is 121.7 degrees. Use the formula for calculating bond length based on the bond angle and distance between nuclei.

asked Jan 23 in Chemical bonding by HarryHodgkin (2.2k points)

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1 answer 62 views

Calculate the lattice energy of sodium chloride (NaCl) using Born-Haber cycle and Hess's law. Given the following data:- Enthalpy of sublimation of sodium (Na): +108.6 kJ/mol- Enthalpy of dissociation of chlorine (Cl2): +243.0 kJ/mol- Bond energy of Na-Cl bond: -412.0 kJ/mol- Ionization energy of sodium (Na): +496.0 kJ/mol- Electron affinity of chlorine (Cl): -349.0 kJ/mol- Heat of formation of sodium chloride (NaCl): -411.0 kJ/mol.

asked Jan 23 in Inorganic Chemistry by MartyLeSouef (2.0k points)

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1 answer 65 views

Calculate the equilibrium constant (Kc) for the reaction between iodine (I2) and potassium iodide (KI) in an aqueous solution, given that at equilibrium, the concentration of iodine is 0.008 M and the concentration of potassium iodide is 0.15 M. The balanced equation for the reaction is given below:I2 (aq) + 2KI (aq) ⇌ 2K+ (aq) + 2I- (aq)

asked Jan 23 in Chemical equilibrium by FawnSharrow (1.9k points)

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1 answer 79 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)

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