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Calculate the bond dissociation energy of the nitrogen-nitrogen (N-N) bond in N2O4 given that the enthalpy change for the reaction 2N2O4(g) --> 4NO2(g) is -109.7 kJ/mol.

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

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1 answer 94 views

Balance the chemical equation for the combustion of propane (C3H8) in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water (H2O).

asked Jan 22 in Chemical reactions by Vance58E9387 (1.9k points)

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1 answer 113 views

A chemical engineer needs to design a distillation column for the separation of a mixture containing ethanol (boiling point of 78.4°C) and water. The desired composition of the distillate is a minimum of 90% ethanol. What is the minimum number of theoretical trays needed in the column to achieve this composition, given that the feed contains 40% ethanol and the reflux ratio is 1.5?

asked Jan 22 in Chemical engineering by OctavioDyaso (2.3k points)

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1 answer 108 views

A chemistry student has mixed 0.1 mol of hydrochloric acid (HCl) with 0.2 mol of sodium hydroxide (NaOH). What is the pH of the resulting solution?

asked Jan 22 in Inorganic Chemistry by KathiFatnown (1.6k points)

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1 answer 102 views

A chemistry student wants to mix 50 mL of water at 25°C with 50 mL of ethanol at 25°C to make a solution. The heat of mixing for water and ethanol is -21.2 kJ/mol. Calculate the heat (in kJ) absorbed or released when the two liquids are mixed. (Assume the densities of water and ethanol are approximately 1 g/mL and 0.8 g/mL, respectively.)

asked Jan 22 in ThermoChemistry by NateDicks693 (1.8k points)

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1 answer 138 views

What is the solubility of calcium carbonate in water at 25°C?

asked Jan 21 in Inorganic Chemistry by HalleySomers (1.8k points)

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1 answer 70 views

Calculate the activation energy required for a chemical reaction to occur, given that the rate constant at 298 K is 4.70 x 10^-3 s^-1 and the rate constant at 313 K is 1.20 x 10^-2 s^-1. (Assume the Arrhenius equation applies.)

asked Jan 23 in Chemical reactions by JanisButterf (2.1k points)

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1 answer 108 views

A chemical reaction of N2O4(g) ⇌ 2NO2(g) is established in a closed vessel at a certain temperature. The initial concentration of N2O4 is 0.1M. At equilibrium, the concentration of NO2 is found to be 0.6M. Calculate the equilibrium concentration of N2O4.

asked Jan 22 in Chemical equilibrium by RebekahH3016 (1.9k points)

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1 answer 62 views

Calculate the enthalpy change for the hydrolysis of 2 moles of sucrose (C12H22O11) given the standard enthalpies of formation of sucrose, glucose, and fructose are -2220 kJ/mol, -1274 kJ/mol, and -915 kJ/mol respectively.

asked Jan 23 in ThermoChemistry by Sterling80B (2.1k points)

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1 answer 101 views

A gas mixture contains equal parts of hydrogen and helium gases in a container at a temperature of 300 K. Determine the total internal energy of the gas mixture using the grand canonical ensemble model.

asked Jan 22 in Physical Chemistry by HermineOverb (2.1k points)

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1 answer 62 views

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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1 answer 98 views

A student needs to calculate the Tafel slopes for the anodic and cathodic reactions from a given set of experimental data obtained during an electrochemical experiment. The experiment involves the corrosion of iron in a solution with a pH of 3.5. The anodic and cathodic current densities were measured at various applied potentials ranging from -700 mV vs SHE to -400 mV vs SHE. The student needs to plot a Tafel plot for each reaction and calculate their corresponding Tafel slopes. Based on the obtained results, the student needs to explain the corrosion mechanism of iron in the given acidic solution.

asked Jan 22 in ElectroChemistry by BrentonMcQua (1.7k points)

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1 answer 69 views

Calculate the amount of heat required to melt 50 grams of ice at 0 C, taking the enthalpy of fusion to be 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by BrodieUus47 (1.7k points)

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1 answer 139 views

What is the functional group present in a sample compound that shows peaks at 1734 cm^-1 and 1640 cm^-1 on an infrared spectrum?

asked Jan 21 in Organic Chemistry by Francisca504 (1.9k points)

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1 answer 95 views

A student performs a chemical reaction between 12.5 grams of magnesium and 15.0 grams of hydrochloric acid to produce magnesium chloride and hydrogen gas. If the theoretical yield of magnesium chloride is 25.7 grams, calculate the percent yield of the reaction.

asked Jan 22 in Chemical reactions by Cameron54A25 (1.9k points)

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1 answer 141 views

Identify the number of possible stereoisomers for a molecule with the molecular formula C5H10O that contains one chiral carbon. Draw all the possible structures indicating their configurations as R or S.

asked Jan 21 in Organic Chemistry by StephaineCro (1.8k points)

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1 answer 102 views

A chemistry student wants to determine the amount of iron present in a sample of orange juice. The student takes a 50 mL sample of orange juice and reacts it with excess potassium dichromate in acidic solution. After the reaction, the remaining potassium dichromate requires 12.75 mL of a 0.015 M ferrous ammonium sulfate solution to complete the reaction. What is the mass of iron present in the sample of orange juice?

asked Jan 22 in Analytical Chemistry by SantoSutclif (1.4k points)

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1 answer 64 views

Calculate the enthalpy change for the combustion of methane gas (CH4) at standard conditions given the following information: 4 moles of methane gas is burned in excess oxygen gas (O2) to form carbon dioxide gas (CO2) and liquid water (H2O). The enthalpy change for the combustion of 1 mole of methane gas is -890.4 kJ/mol.

asked Jan 23 in Chemical thermodynamics by ChanteStroh (1.5k points)

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1 answer 66 views

Calculate the bond order of O2, O2+, O2- and O22-.

asked Jan 23 in Chemical bonding by VeroniqueBig (1.6k points)

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1 answer 66 views

Calculate the bond order and bond length of the N-O bond in nitric oxide (NO) using molecular orbital theory.

asked Jan 23 in Inorganic Chemistry by Lachlan74F5 (2.0k points)

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