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Calculate the Gibbs free energy change (ΔG) for the reaction:N2(g) + 3H2(g) ⇌ 2NH3(g)Given the standard Gibbs free energy of formation (ΔG°f) values at 298 K are:ΔG°f of NH3(g) = -16.6 kJ/molΔG°f of N2(g) = 0 kJ/molΔG°f of H2(g) = 0 kJ/molAssume ideal gas behavior for all gases involved in the reaction.

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

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Calculate the amount of heat released when 25 g of NaCl is crystallized from a solution at its saturation point. The heat of crystallization of NaCl is -788 J/g.

asked Jan 23 in ThermoChemistry by NiklasCave18 (1.6k points)

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1 answer 82 views

A solution of NaCl was electrolyzed using a current of 2.0 A for 30 minutes. If 0.20 grams of NaCl was consumed in the process, what is the value of the Faraday constant?

asked Jan 22 in ElectroChemistry by FelixTolmer3 (1.9k points)

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Calculate the bond order and bond length of the N-O bond in the nitrite ion (NO2-).

asked Jan 23 in Inorganic Chemistry by ZellaSeamon3 (1.6k points)

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1 answer 84 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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Calculate the bond dissociation energy (in kJ/mol) of the C-H bond in methane (CH4) using experimental data.

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

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1 answer 48 views

Calculate the corrosion current density of a copper metal in 1 M HCl solution at 25°C, given that the corrosion potential of copper electrode in the given environment is -0.35 V(SHE) and the exchange current density is 0.038 A/m². Also, determine the corrosion rate of copper in the same environment if the density of copper is 8.96 g/cm³.

asked Jan 23 in ElectroChemistry by Jerry12T3434 (1.7k points)

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A chemistry student is investigating the surface area of activated carbon for an adsorption experiment. Using BET theory of multilayer adsorption, determine the specific surface area of the activated carbon based on the following data: - Mass of activated carbon used: 0.25g- Nitrogen adsorption at various pressures (in mmHg): - 6.523 - 9.785 - 13.092 - 19.638 - 31.725 - 45.200 - 61.587 - 84.632 - 114.684 - 147.087 Assume that the area occupied by one nitrogen molecule is 0.162 nm², and use the BET equation to calculate the specific surface area of the activated carbon material.

asked Jan 22 in Surface Chemistry by Annett65L392 (2.1k points)

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1 answer 51 views

Calculate the amount of heat required to polymerize 2 moles of styrene into polystyrene given the following information:The enthalpy of polymerization for styrene is -56 kJ/mol and the reaction is exothermic.

asked Jan 23 in ThermoChemistry by NamSampson2 (1.8k points)

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Calculate the cell potential for the following galvanic cell where a nickel anode is placed in a 1.0M Ni(NO3)2 solution and a silver cathode is placed in a 1.0M AgNO3 solution. The balanced equation for the cell reaction is: Ni(s) + 2 Ag+(aq) → Ni2+(aq) +2 Ag(s) Assume that standard reduction potentials for each half-reaction are as follows: Ni2+(aq) + 2 e- ⇌ Ni(s) E° = -0.25V Ag+(aq) + e- ⇌ Ag(s) E° = +0.80V What is the cell potential at standard conditions (25°C and 1 atm)?

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

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1 answer 84 views

A chemistry student wants to analyze a sample of wastewater from a local factory. They want to know the concentration of the pollutants from the wastewater before releasing it into the environment. The sample is collected in a 500 mL container. After performing the required tests, the student determines that the total dissolved solids (TDS) in the sample are 750 mg/L, and the concentration of NaCl in the sample is 150 mg/L. Calculate the mass of TDS and NaCl in the sample.

asked Jan 22 in Analytical Chemistry by ShaunBehan45 (2.8k points)

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1 answer 51 views

Calculate the amount of chloride ions (Cl-) present in a 0.500 g sample of a sodium chloride (NaCl) solution using coulometry. The electric current used in the process was 2.26 A, and the time taken to completely react the sample was 120 s. The molecular weight of NaCl is 58.44 g/mol, and 1 mol of NaCl contains 1 mol of Cl-.

asked Jan 23 in Analytical Chemistry by MyrnaFaerber (1.8k points)

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1 answer 80 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)

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1 answer 51 views

Calculate the activation energy for the reaction between hydrogen gas and iodine gas to form hydrogen iodide, given that the rate constant at 25°C is 4.2 × 10^-4 L/mol.s and the frequency factor is 1.5 × 10^12 s^-1.

asked Jan 23 in Chemical reactions by ScarlettRobb (1.7k points)

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1 answer 41 views

Calculate the enthalpy of combustion of methane gas (CH4), given that the heat released when 1.0 g of methane completely burns in excess oxygen is -890 kJ.

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

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1 answer 79 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 42 views

Calculate the enthalpy change of dissolving 10.0 g of sodium hydroxide (NaOH) in 200.0 mL of water at 25°C. Given: the enthalpy of dissolution of NaOH is -44.5 kJ/mol.

asked Jan 23 in ThermoChemistry by JuliannSfd66 (2.0k points)

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1 answer 87 views

A chemistry student needs to determine the enthalpy of desorption for a specific substance. The substance was adsorbed onto activated carbon in a packed bed reactor at 25°C and under a pressure of 4 bar. The adsorption process was carried out until saturation was reached. The packed bed reactor was then heated to 100°C until complete desorption. The pressure was maintained at 4 bar during the entire process. Given the initial mass of the adsorbate and the final mass of the activated carbon, calculate the enthalpy of desorption for the substance.

asked Jan 22 in ThermoChemistry by JannaWales93 (2.0k points)

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1 answer 51 views

Based on the subtopic The effect of pH on the photochemical reaction rate, a possible precise question for a chemistry student to solve could be:How does the pH level affect the rate of the photochemical reaction between chlorophyll and 1,5-dihydroxynaphthalene?

asked Jan 23 in PhotoChemistry by Ashleigh66X2 (1.9k points)

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1 answer 43 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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