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Calculate the heat absorbed or released during the crystallization of 50g of sodium acetate from a solution if the enthalpy change of the process is -3.9 kJ/mol.

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

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1 answer 70 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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1 answer 112 views

A chemical plant needs to separate a mixture of benzene and toluene using a distillation column. The feed contains 40% benzene and 60% toluene. Design a distillation column to achieve a distillate with at least 90% purity of benzene. Provide the reflux ratio and the number of theoretical trays required to meet the purity specification. Assume an operating pressure of 1 atm and th

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

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1 answer 66 views

Calculate the enthalpy change for the hydrolysis of 50 grams of sucrose (C12H22O11) when dissolved in 500 ml of water at 25°C. The molar mass of sucrose is 342.3 g/mol and the enthalpy change per mole of sucrose is -564.8 kJ/mol.

asked Jan 23 in ThermoChemistry by Marlene31P52 (2.5k points)

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1 answer 66 views

Calculate the enthalpy change for the hydrolysis of 5 moles of methyl acetate using the given bond enthalpies: C-O (360 kJ/mol), C=O (740 kJ/mol), O-H (460 kJ/mol), and C-H (410 kJ/mol).

asked Jan 23 in ThermoChemistry by ScottyWild8 (1.4k points)

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1 answer 64 views

Calculate the enthalpy of adsorption of hydrogen gas on activated carbon if 2 grams of activated carbon absorb 0.025 moles of hydrogen gas at 298 K and the pressure of the system is 1 atm. The molar enthalpy of hydrogen gas is -285.8 kJ/mol at constant pressure.

asked Jan 23 in ThermoChemistry by MaxwellDuff3 (1.9k points)

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1 answer 73 views

Calculate the amount of heat required to sublimate 10 grams of dry ice (solid carbon dioxide) at a temperature of -78.5°C. The heat of sublimation of carbon dioxide is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by BYUBlake479 (2.0k points)

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1 answer 114 views

A 50 mL solution of 0.1 M Cu(NO3)2 was electrolyzed for 20 minutes. During this time, a current of 0.5 A was passed through the solution. What is the final concentration of Cu2+ ions in the solution after the electrolysis?

asked Jan 22 in ElectroChemistry by LavadaKissne (2.4k points)

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1 answer 70 views

Calculate the change in enthalpy (ΔH) for the following reaction at 25°C given the standard enthalpies of formation for each compound: 2H2(g) + O2(g) → 2H2O(g) Standard enthalpies of formation: ΔHf° (H2O)(g) = -241.82 kJ/molΔHf° (H2)(g) = 0 kJ/molΔHf° (O2)(g) = 0 kJ/mol

asked Jan 23 in Physical Chemistry by TatianaSteil (2.3k points)

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1 answer 105 views

A container has a mixture of nitrogen and oxygen gases at equilibrium. If the temperature of the container is increased, predict the direction in which the equilibrium will shift according to Le Chatelier's principle and explain why.

asked Jan 22 in Chemical reactions by AmelieW70701 (1.7k points)

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1 answer 69 views

Calculate the corrosion rate of iron (Fe) in a galvanic couple with copper (Cu), given that the area of the iron electrode is 8 cm² and the current density is 0.6 mA/cm². The standard electrode potential of iron is -0.44 V and that of copper is +0.34 V.

asked Jan 23 in ElectroChemistry by Precious09K0 (2.0k points)

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1 answer 54 views

Calculate the lattice energy of calcium fluoride (CaF2) given that the lattice enthalpy of formation of Ca2+ is +178 kJ/mol, the lattice enthalpy of formation of F- is -328 kJ/mol and the distance between the Ca2+ and F- ions is 231 pm.

asked Jan 23 in Inorganic Chemistry by ChastityHoll (1.8k points)

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1 answer 69 views

Calculate the corrosion rate of a copper metal when it is placed in a galvanic couple with zinc metal. The potential difference between the two metals is measured to be 1.5 V and the surface area of the copper metal is 2 cm². The density of copper is 8.96 g/cm³ and its atomic weight is 63.546 g/mol. The atomic weight of zinc is 65.38 g/mol and its density is 7.14 g/cm³. At constant temperature and pressure, assume that the Faraday constant is 96,485 Coulombs/mol and that one mole of electrons is equivalent to one Faraday.

asked Jan 23 in ElectroChemistry by TiffaniWymar (1.6k points)

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1 answer 105 views

A chemistry student wants to synthesize alum (KAl(SO4)2.12H2O) from 12 g of potassium hydroxide (KOH) and excess sulfuric acid (H2SO4). If the actual yield of the reaction is 9.3 g, what is the percent yield of this reaction?

asked Jan 22 in Chemical reactions by AlfredLamb10 (2.1k points)

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1 answer 71 views

Calculate the bond dissociation energy (in kJ/mol) for the O-H bond in water (H2O) given that the enthalpy change for the reaction H2O (g) → H (g) + OH(g) is +495 kJ/mol and the enthalpy change for the reaction H2(g) + 1/2O2(g) → H2O(g) is -241.8 kJ/mol.

asked Jan 23 in ThermoChemistry by UweEales0685 (1.8k points)

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1 answer 73 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 116 views

A 25 g sample of water at 25°C is heated by 200 J. The temperature of the water increases to 40°C. Calculate the specific heat capacity of water.

asked Jan 22 in Chemical thermodynamics by OrvalFrankla (1.9k points)

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1 answer 144 views

What is the major product of the reaction between 2-methyl-2-butene and HBr in an aqueous solution?

asked Jan 21 in Organic Chemistry by BrianneWoodw (2.2k points)

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1 answer 116 views

How would adding more reactants to a reaction at equilibrium affect the direction of the reaction and the equilibrium position, and what would be the quantitative effect on the equilibrium constant?

asked Jan 22 in Chemical equilibrium by DUPMathias4 (2.1k points)

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1 answer 73 views

Calculate the activation energy for the electrochemical reaction of zinc and copper sulfate solution using the slope of the Tafel plot obtained from the data collected during a cyclic voltammetry experiment.

asked Jan 23 in ElectroChemistry by IFYRussel191 (2.2k points)

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