Recent questions in Chemistry

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Calculate the anodic Tafel slope for an electrochemical cell in which the corrosion current density is 0.05 mA/cm² and the anodic overpotential is 50 mV. The exchange current density for the anodic reaction is 0.02 mA/cm².

asked Jan 23 in ElectroChemistry by JaimeThurber (470 points)

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1 answer 6 views

Calculate the anodic Tafel slope for a reaction with an exchange current density of 2x10^-4 A cm^-2 if the current density at an anodic potential of 0.1V vs the standard hydrogen electrode (SHE) is 0.5 mA cm^-2 and at 0.2V vs SHE is 2.0 mA cm^-2. Assume a linear relationship between current density and overpotential.

asked Jan 23 in ElectroChemistry by VeraThrasher (450 points)

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1 answer 51 views

Calculate the anodic Tafel slope (in mV/decade) for the corrosion of iron in a solution containing 0.1 M HCl, given that the corrosion current density is 2.5 mA/cm2 and the exchange current density is 0.25 mA/cm2. Assume T = 25°C and the activation energy of the reaction is 40 kJ/mol.

asked Jan 23 in ElectroChemistry by JannetteToup (430 points)

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1 answer 42 views

Calculate the amount of ozone depletion caused by the release of 1000 metric tons of chlorofluorocarbons (CFCs) into the atmosphere and explain the impact it can have on the atmosphere in terms of UV radiation and human health.

asked Jan 23 in Environmental Chemistry by LaurelFeuers (390 points)

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1 answer 54 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 KellieSchlei (410 points)

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1 answer 60 views

Calculate the amount of heat required to sublime 50 grams of dry ice (CO2) at -78.5°C given that the heat of sublimation for CO2 is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by JonnieBonet (630 points)

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1 answer 37 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 RaymonLamar7 (770 points)

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1 answer 56 views

Calculate the amount of heat required to raise the temperature of 50 grams of water from 25°C to 85°C, given the specific heat of water is 4.184 J/g°C.

asked Jan 23 in ThermoChemistry by LarueDaddari (430 points)

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1 answer 59 views

Calculate the amount of heat required to raise the temperature of 50 g of water from 25°C to 100°C, given the specific heat capacity of water is 4.18 J/g°C.

asked Jan 23 in Chemical thermodynamics by LesleeShumak (500 points)

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1 answer 38 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 JillAinslie3 (540 points)

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1 answer 44 views

Calculate the amount of heat required to melt 50 grams of ice at 0°C, given that the enthalpy of fusion of ice is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by OOLRose35625 (370 points)

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1 answer 45 views

Calculate the amount of heat required to melt 50 grams of ice at 0°C and convert it into liquid water at the same temperature. The enthalpy of fusion of ice is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by LeonoreRisch (310 points)

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1 answer 41 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 FlynnA74878 (210 points)

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1 answer 44 views

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 PBODenny8587 (430 points)

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1 answer 48 views

Calculate the amount of heat required to melt 20 grams of ice at 0°C and convert it to liquid water at 0°C. The enthalpy of fusion of water is 6.01 kJ/mol. Show all the steps of your calculations.

asked Jan 23 in ThermoChemistry by JennyCouch7 (270 points)

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1 answer 43 views

Calculate the amount of heat required to break all the bonds in 5 moles of carbon dioxide using the bond energy values for the C=O bond and the O-H bond.

asked Jan 23 in Chemical reactions by Antoinette08 (510 points)

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1 answer 45 views

Calculate the amount of heat released when 50 grams of NaOH is dissolved in 500 mL of water at 25°C. The heat of crystallization of NaOH is -44.51 kJ/mol. Assume the final temperature of the solution is 25°C and the heat capacity of the solution is 4.18 J/g °C.

asked Jan 23 in ThermoChemistry by JohnsonBosto (750 points)

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1 answer 40 views

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 EveShaver330 (510 points)

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1 answer 59 views

Calculate the amount of heat released when 10.0 g of methane gas (CH4) is burned in excess oxygen at constant pressure, given that the enthalpy of combustion of methane is -890.3 kJ/mol.

asked Jan 23 in Physical Chemistry by MichaleRenne (230 points)

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1 answer 54 views

Calculate the amount of heat released when 10.0 g of methane (CH4) is burned completely in excess oxygen if the enthalpy of combustion of methane is -890 kJ/mol.

asked Jan 23 in Physical Chemistry by MichelleHoli (490 points)

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