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Calculate the enthalpy change for the precipitation reaction between 25.0 mL of 0.100 M silver nitrate (AgNO3) and excess calcium chloride (CaCl2) solution at 25°C. The balanced equation for the reaction is:AgNO3(aq) + CaCl2(aq) → AgCl(s) + Ca(NO3)2(aq)Assume the density of the solutions is equal to 1.00 g/mL and the solutions have the same specific heat as water (4.18 J/g°C).

asked Jan 23 in ThermoChemistry by JordanChun58 (2.3k points)

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Calculate the enthalpy change for the desorption of water vapor from a silica gel desiccant using the following information:Mass of silica gel desiccant = 5.0 gInitial temperature of silica gel desiccant and water vapor = 25.0 °CFinal temperature after desorption of water vapor = 40.0 °CSpecific heat capacity of silica gel = 1.16 J/g°CHeat absorbed by the calorimeter = -222.4 JAssume all heat absorbed by calorimeter comes solely from the desorption of water vapor.

asked Jan 23 in ThermoChemistry by ClydeC545764 (2.2k points)

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Calculate the bond order of the molecule NO using molecular orbital theory, given that the nitrogen atom has four valence electrons and the oxygen atom has six valence electrons.

asked Jan 23 in Chemical bonding by Lachlan74F5 (2.0k points)

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A chemistry student wants to see the effect of adding a specific buffer on the equilibrium position of a 0.1 M acetic acid (CH3COOH) and 0.1 M sodium acetate (CH3COONa) solution. If the initial pH of the solution is 4.7, what is the pH of the solution after adding the buffer? (Ka of acetic acid is 1.8 x 10^-5).

asked Jan 22 in Chemical equilibrium by AliceW140134 (2.0k points)

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Calculate the amount of copper deposited on the cathode when a current of 5 amperes is passed through a copper sulfate solution for a duration of 30 minutes. The molar mass of copper is 63.55 g/mol and the Faraday constant is 96500 C/mol. The electrode area is 10 cm² and the copper sulfate solution has a concentration of 0.1 M. Assume 100% efficiency in the electrochemical reaction.

asked Jan 23 in ElectroChemistry by ChristianeBo (2.0k points)

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Calculate the corrosion current density of an iron rod having a surface area of 15 cm², immersed in an acid solution (pH=3) with a temperature of 50°C. The concentration of iron ions (Fe²⁺) in the solution is 0.1 M, and the standard reduction potential of iron is -0.44 V. The Tafel slope obtained experimentally is 0.12 V/decade. Use the Tafel equation to calculate the corrosion current density (in A/cm²) of the iron rod.

asked Jan 23 in ElectroChemistry by ClaritaSifue (1.8k points)

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Calculate the bond length between two oxygen atoms in an O2 molecule, given that the O-O bond energy is 498 kJ/mol and the reduced mass of the system is 15.9994 g/mol.

asked Jan 23 in Chemical bonding by AdeleStrothe (2.1k points)

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Calculate the enthalpy of isomerization for butene to isobutene given the following bond dissociation energies (in kJ/mol): C-C = 345, C=C = 614, C-H = 413.

asked Jan 23 in ThermoChemistry by TraceeKeith9 (1.8k points)

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Calculate the enthalpy change of adsorption for the adsorption of CO gas on activated carbon at 25°C, given that the equilibrium constant for the reaction is 1.5×10^3 L/mol and the molar density of CO is 1.25 g/L. The surface area of activated carbon used is 50 m^2/g, and the initial pressure of CO is 2.5 atm.

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

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Calculate the enthalpy change for the hydrolysis of 2 moles of sucrose (C12H22O11) given that the enthalpy change of hydrolysis for 1 mole of sucrose is -564 kJ/mol.

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

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Calculate the change in entropy when 1 mole of methane gas (CH4) is burned completely in oxygen gas (O2) at constant pressure and 298 K.

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

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Calculate the enthalpy change for the following reaction:2H2O2(aq) → 2H2O(l) + O2(g)Using the following information:2H2O(l) + 105.2 kJ → 2H2(g) + O2(g)2H2(g) + O2(g) → 2H2O2(aq) + 484.4 kJ

asked Jan 23 in Chemical reactions by LuzMccrary7 (2.5k points)

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Calculate the amount of heat required to melt 25 grams of ice at 0°C. The enthalpy of fusion of ice is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by EmilySulman6 (2.0k points)

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1 answer 49 views

Calculate the enthalpy change when solid sodium hydroxide (NaOH) is dissolved into water, given that the desorption enthalpy of NaOH is 44.51 kJ/mol and the molar heat of solution is -44.51 kJ/mol.

asked Jan 23 in ThermoChemistry by LeesaJ55672 (1.9k points)

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Calculate the change in enthalpy for the combustion of 2 moles of methane gas (CH4) at a constant pressure of 1 atmosphere and a temperature of 298 K. Given the standard enthalpy of formation for methane is -74.81 kJ/mol.

asked Jan 23 in Physical Chemistry by JadaMeece33 (1.6k points)

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Calculate the enthalpy change for the precipitation reaction between 50.0 mL of 0.150 M silver nitrate solution and excess sodium chloride solution if the temperature change was measured to be -5.47°C. The molar mass of AgNO3 is 169.87 g/mol, and the density of the silver nitrate solution is 1.05 g/mL. The reaction is as follows: AgNO3(aq) + NaCl(aq) -> AgCl(s) + NaNO3(aq).

asked Jan 23 in ThermoChemistry by AdelaideYwt4 (1.6k points)

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Calculate the corrosion rate of a copper wire of diameter 0.5 cm and length 20 cm when immersed in a solution containing 1M HCl for 24 hours. The initial and final weights of the wire were 6.0 g and 5.6 g, respectively. The density of copper is 8.96 g/cm³. What is the corrosion rate of the copper wire in mm/year?

asked Jan 23 in ElectroChemistry by LeonelSiede (1.9k points)

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Calculate the cell potential for the following electrochemical reaction at 25°C: Zn(s) + 2AgNO3(aq) → Zn(NO3)2(aq) + 2Ag(s) Given: E°(Ag+/Ag) = +0.80 V E°(Zn2+/Zn) = −0.76 V

asked Jan 23 in ElectroChemistry by Lynell160113 (1.8k points)

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Calculate the bond dissociation energy of the H-H bond given the following information: The enthalpy change for the reaction 2H2(g) → 4H(g) is +436 kJ/mol, and the average bond dissociation energy for a H-H bond is 436 kJ/mol.

asked Jan 23 in ThermoChemistry by ZakOleary170 (1.8k points)

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Calculate the bond dissociation energy of the carbon-hydrogen bond in methane (CH4), given that the reaction CH4(g) → CH3(g) + H(g) has a ΔH° of 435 kJ/mol.

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

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