Recent questions in ThermoChemistry

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Calculate the enthalpy change when 50 mL of 0.2 M sodium chloride solution is mixed with 50 mL of 0.2 M silver nitrate solution. The final temperature of the solution was found to be 25°C and the initial temperature of the reactants was 30°C. The specific heat of the solution is 4.18 J/g°C, and the density of the solution is 1.00 g/mL.

asked Jan 23 in ThermoChemistry by GeorgettaCon (430 points)

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Calculate the enthalpy change when 50 ml of 0.2 M sodium chloride solution is mixed with 50 ml of 0.1 M silver nitrate solution. Given the enthalpy of precipitation of silver chloride as -64.8 kJ/mol.

asked Jan 23 in ThermoChemistry by AdrieneSimps (410 points)

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Calculate the enthalpy change when 2.5 moles of methane gas is completely burned in excess oxygen gas if the enthalpy of formation of methane is -74.8 kJ/mol and the enthalpy of formation of water is -285.8 kJ/mol, and the enthalpy of formation of carbon dioxide is -393.5 kJ/mol.

asked Jan 23 in ThermoChemistry by DelFannin06 (410 points)

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Calculate the enthalpy change when 2 moles of nitrogen gas are adsorbed onto the surface of activated charcoal at a temperature of 298 K, given that the pressure of nitrogen is 1 atm and the final pressure of nitrogen adsorbed is 0.5 atm. The standard enthalpy of formation of nitrogen gas is 0 kJ/mol.

asked Jan 23 in ThermoChemistry by ImogenePined (310 points)

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Calculate the enthalpy change required to ionize 2 moles of magnesium atoms to form Mg2+ ions, given that the first ionization energy of magnesium is 737 kJ/mol and the second ionization energy is 1450 kJ/mol.

asked Jan 23 in ThermoChemistry by AltaDeamer5 (510 points)

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Calculate the enthalpy change of the reduction reaction of Fe3+ to Fe2+ when 1.44 g of Fe3+ ions are reduced using a standard hydrogen electrode (E° = 0.00 V) at 298 K. The balanced half-reaction equations are given below:Fe3+ + e- → Fe2+ ( E° = +0.77 V)H+ + e- → 1/2 H2(g) ( E° = 0.00 V)

asked Jan 23 in ThermoChemistry by MellisaKrame (470 points)

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Calculate the enthalpy change of the polymerization reaction of ethylene, given that the heat of combustion of ethylene is -1411 kJ/mol and the enthalpy of formation of ethylene is +52.3 kJ/mol. The balanced equation for the polymerization of ethylene is:nC2H4 -> [-C2H4-]nAssume complete polymerization and that the standard enthalpy of formation of the polymer is negligible.

asked Jan 23 in ThermoChemistry by PrinceHavila (530 points)

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Calculate the enthalpy change of the polymerization reaction of ethylene, given that the enthalpy of combustion of ethylene is -1411.1 kJ/mol and that the polymerization of ethylene releases 3.4 kJ/mol.

asked Jan 23 in ThermoChemistry by DelilaPike1 (270 points)

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Calculate the enthalpy change of the polymerization of styrene using the following information: Reactants: - Styrene: C8H8 (l) - Peroxide initiator: C6H5OOC(CH3)3 (l) Products: - Polystyrene: (C8H8)n (s)- Byproduct: CO2 (g)Given information: - Heat of formation of CO2 (g) = -393.5 kJ/mol - Mass of styrene used = 50 g - Molarity of the initiator solution = 0.3 M - Volume of the initiator solution used = 25 mL - Density of the initiator solution = 0.89 g/mL - The reaction is carried out at a constant pressure of 1 atm and a temperature of 25°C.

asked Jan 23 in ThermoChemistry by WiltonRuatok (430 points)

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1 answer 56 views

Calculate the enthalpy change of the isomerization of but-2-ene to 2-methylpropene given the standard enthalpy of formation of but-2-ene is -20.4 kJ/mol and that of 2-methylpropene is -27.0 kJ/mol. The reaction is carried out at constant pressure and 298 K.

asked Jan 23 in ThermoChemistry by Brigida91483 (470 points)

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Calculate the enthalpy change of the following reaction: 2C(s) + 2H2(g) + 5O2(g) -> 2CO2(g) + 2H2O(l) Given the enthalpies of formation of CO2(g), H2O(l), and H2(g) are -393.5 kJ/mol, -285.8 kJ/mol, and -241.8 kJ/mol, respectively.

asked Jan 23 in ThermoChemistry by LucyGreene29 (490 points)

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1 answer 55 views

Calculate the enthalpy change of the dissolution of 5 grams of sodium hydroxide (NaOH) in 100 mL of water, given the molar enthalpy of dissolution of NaOH to be -44 kilojoules per mole.

asked Jan 23 in ThermoChemistry by ReganPennell (310 points)

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Calculate the enthalpy change of solution for 5.00 g of ammonium chloride (NH4Cl) dissolved in 50.0 mL of water, given that the temperature of the solution decreases by 4.21°C. The density of water is 1.00 g/mL and the specific heat capacity of the solution is 4.18 J/g°C. The molar mass of ammonium chloride is 53.49 g/mol.

asked Jan 23 in ThermoChemistry by MarielKeble (1.1k points)

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1 answer 51 views

Calculate the enthalpy change of solution for 2.0 moles of sodium chloride in 500.0 mL of water at 25°C. The molar heat of solution of sodium chloride is -3.91 kJ/mol.

asked Jan 23 in ThermoChemistry by MiraFossey3 (310 points)

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1 answer 53 views

Calculate the enthalpy change of reduction for Fe2O3 using the following data:Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) ΔH°rxn = -26.8 kJ mol^-1Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(l) ΔH°rxn = +824.2 kJ mol^-1Note: The standard enthalpy of formation for CO2(g) is -393.5 kJ mol^-1 and for Al2O3(s) is -1675.7 kJ mol^-1.

asked Jan 23 in ThermoChemistry by BlakeSalaam (450 points)

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Calculate the enthalpy change of precipitation when 50 ml of 0.1 M silver nitrate (AgNO3) is added to 50 ml of 0.1 M sodium chloride (NaCl) solution. The temperature of the mixture increases by 5.0 °C. Given the specific heat capacity of the solution is 4.18 J/g °C and the density of the solution is 1.0 g/mL.

asked Jan 23 in ThermoChemistry by LPFVirgie959 (590 points)

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1 answer 58 views

Calculate the enthalpy change of precipitation when 50 mL of 0.1 M calcium chloride solution is mixed with 50 mL of 0.1 M silver nitrate solution, assuming that the reaction goes to completion and the temperature remains constant at 25°C.

asked Jan 23 in ThermoChemistry by Lea50604912 (270 points)

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Calculate the enthalpy change of polymerization for the formation of polystyrene from its monomer, styrene, given the following data:- ΔH°f (Styrene) = -25.68 kJ/mol- Bond enthalpies: C-C = 347 kJ/mol; C=C = 611 kJ/mol; C-H = 413 kJ/mol

asked Jan 23 in ThermoChemistry by ChristalFurm (430 points)

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Calculate the enthalpy change of oxidation for the combustion of 1 mole of ethane gas (C₂H₆) in oxygen gas (O₂) to form carbon dioxide gas (CO₂) and water vapor (H₂O), given the following enthalpies of formation: ΔHf(C₂H₆) = -84.7 kJ/mol, ΔHf(CO₂) = -393.5 kJ/mol, ΔHf(H₂O) = -241.8 kJ/mol.

asked Jan 23 in ThermoChemistry by LowellGilrea (330 points)

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1 answer 47 views

Calculate the enthalpy change of mixing 50 mL of 1 M HCl with 50 mL of 1 M NaOH at 25°C. It is known that the standard enthalpies of formation of HCl and NaOH are -92.3 kJ/mol and -469.2 kJ/mol, respectively. Assume that the heat capacity of the mixture is 4.18 J/g°C and the density of the solution is 1 g/mL.

asked Jan 23 in ThermoChemistry by WilliemaeMcG (610 points)

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