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Calculate the enthalpy change of adsorption when 2.5 moles of nitrogen gas are adsorbed onto 10 g of activated charcoal at 298 K, given that the pressure of nitrogen gas is 1.0 atm. The molar mass of nitrogen is 28 g/mol, and the initial pressure of nitrogen is 0.5 atm.

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

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1 answer 85 views

Calculate the amount of heat that needs to be absorbed to crystallize 100 grams of sodium acetate (CH3COONa) from a saturated solution at 40°C. The heat of crystallization for sodium acetate is -264 kJ/mol.

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

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Calculate the heat of hydration for the reaction where 1 mol of anhydrous copper sulfate combines with 5 mol of water to form 1 mol of hydrated copper sulfate given that the enthalpy change of the reaction is -65 kJ/mol.

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

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1 answer 124 views

A chemistry student is given a sample of an unknown salt consisting of a mixture of two compounds. The student is asked to determine the percentage composition of each compound in the salt using mass balance calculations. The total mass of the sample is 10 grams, and after performing careful analysis, the student obtains the following data: One compound has a molar mass of 80 g/mol and comprises 60% of the total mass of the salt. The other compound has a molar mass of 120 g/mol and comprises 40% of the total mass of the salt. What are the percentage compositions of each compound in the salt?

asked Jan 22 in Analytical Chemistry by RosieBloom03 (1.8k points)

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1 answer 70 views

Calculate the equilibrium constant (Kc) for the following gas-phase reaction at 298 K: N2(g) + O2(g) ⇌ 2NO(g) where the initial concentrations of N2, O2, and NO are 0.100 M, 0.050 M, and 0.000 M respectively.

asked Jan 23 in Chemical equilibrium by Cameron54A25 (1.9k points)

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1 answer 119 views

A chemistry student wants to determine the Faraday constant (F) by electroplating copper on a platinum electrode using a current of 2.0 A for 10 minutes. Calculate the amount of copper deposited and use this information to determine the value of the Faraday constant.

asked Jan 22 in ElectroChemistry by NilaBody107 (1.7k points)

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1 answer 83 views

Calculate the cell potential for the following electrochemical reaction:Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)Given that the standard reduction potentials for the half-reactions are as follows:Zn2+(aq) + 2e- → Zn(s) E° = -0.76 VCu2+(aq) + 2e- → Cu(s) E° = +0.34 V

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

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1 answer 70 views

Calculate the entropy change of an ideal monatomic gas at 1 atm and 300 K when it expands isothermally to 5 times its initial volume.

asked Jan 23 in Physical Chemistry by Shawn33B4717 (1.9k points)

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1 answer 79 views

Calculate the enthalpy change for the dissolution of 10 g of NaOH in 100 mL of water at 25°C. The molar heat of dissolution of NaOH is -44.51 kJ/mol.

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

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1 answer 68 views

Calculate the heat of formation (∆Hf) of water (H2O) given the following reactions and their respective heats of reaction (∆Hr):2H2(g) + O2(g) → 2H2O(g); ∆Hr = -484 kJ/mol ½ O2(g) + H2(g) → H2O(l); ∆Hr = -285.8 kJ/mol Note: The heat of formation is the amount of heat released or absorbed when one mole of a compound is formed from its elements in their standard states.

asked Jan 23 in Chemical bonding by SelmaHartsoc (1.8k points)

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1 answer 71 views

Calculate the enthalpy of solution of sodium hydroxide (NaOH) in water, given that the heat absorbed by the solution is 128.0 kJ/mol and the molar concentration of the solution is 0.1 M. Assume that the specific heat capacity of the solution is the same as that of water (4.18 J/g⋅K) and that the density of the solution is 1.00 g/mL.

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

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1 answer 119 views

A chemistry student wants to create a chemical reaction that produces exactly 25 grams of water. How many grams of hydrogen and oxygen would need to react to create this amount of water?

asked Jan 22 in Chemical reactions by MarilynnAnth (1.7k points)

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1 answer 67 views

Calculate the heat required to sublime 25 grams of dry ice (CO2) at a temperature of -78.5 °C if the enthalpy of sublimation is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by HIELucille73 (2.1k points)

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1 answer 84 views

Calculate the bond dissociation energy for the C-H bond in methane (CH4) using the following data:- The heat of combustion of methane is -890 kJ/mol.- The enthalpy of formation of CO2 is -393.5 kJ/mol.- The enthalpy of formation of H2O is -285.8 kJ/mol.- The heat of combustion of hydrogen is -286 kJ/mol.

asked Jan 23 in ThermoChemistry by NadiaN491716 (2.1k points)

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1 answer 84 views

Calculate the bond dissociation energy (in kJ/mol) required to break the carbon-hydrogen bond in methane using the given bond dissociation energies: C-H = 413 kJ/mol, C-C = 347 kJ/mol, C=C = 602 kJ/mol, H-H = 436 kJ/mol.

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

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1 answer 118 views

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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1 answer 76 views

Calculate the enthalpy of desorption of CO2 from sodium hydroxide (NaOH) pellets given the following information: - The heat of absorption of CO2 by NaOH pellets is -20.9 kJ/mol.- The standard enthalpy of formation of Na2CO3 is -1130 kJ/mol.- The standard enthalpy of formation of water is -286 kJ/mol.- The standard enthalpy of formation of NaOH is -425 kJ/mol. Assuming that the desorption process is the reverse of the absorption process, determine the enthalpy change for the reaction: Na2CO3(s) + H2O(l) → 2NaOH(s) + CO2(g).

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

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1 answer 83 views

Calculate the bond order and bond length of the nitrogen-oxygen bond in the nitrate ion (NO3-).

asked Jan 23 in Inorganic Chemistry by AmyNowland4 (2.5k points)

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1 answer 69 views

Calculate the exchange current density at the interface between a silver electrode and an aqueous solution of silver ions, given that the standard reduction potential for the Ag+/Ag half-cell is +0.80 V, the concentration of Ag+ in the solution is 0.025 M, and the temperature is 25°C.

asked Jan 23 in ElectroChemistry by CornellNicho (2.1k points)

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1 answer 122 views

A chemistry student needs to determine the major product(s) formed from the reaction between 1-bromo-3-methylcyclohexane and sodium ethoxide in ethanol solvent with a heat source. What are the major products formed and explain the mechanism of the reaction?

asked Jan 22 in Organic Chemistry by MargueriteSl (1.9k points)

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