Recent questions in ThermoChemistry

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Calculate the enthalpy of solution of sodium chloride (NaCl) when 10 grams of NaCl is dissolved in 100 mL of water assuming that the specific heat capacity of the solution is equal to the specific heat capacity of water (4.18 J/g°C) and the temperature change is negligible.

asked Jan 23 in ThermoChemistry by MagnoliaReve (450 points)

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Calculate the enthalpy of solution for the dissolution of 15g of potassium chloride (KCl) in 100g of water (H2O) given that the temperature change was -12.5°C. The enthalpy of fusion for KCl is 17.2 kJ/mol and the specific heat capacity of water is 4.18 J/g•°C.

asked Jan 23 in ThermoChemistry by LacyBastyan (550 points)

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Calculate the enthalpy of solution for dissolving 5 grams of NaCl in 100 mL of water if the final temperature of the solution is 25°C and the initial temperature of the water was 20°C. The enthalpy of fusion of NaCl is -3.0 kJ/mol and the specific heat capacity of the solution is 4.18 J/g°C.

asked Jan 23 in ThermoChemistry by MilagroEub10 (590 points)

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Calculate the enthalpy of solution for 10.0 g of potassium chloride (KCl) dissolved in 100 mL of water, given that the temperature of the solution decreases from 25°C to 20°C. Assume the heat capacity of the solution to be 4.184 J/g°C and that there is no heat loss to the surroundings.

asked Jan 23 in ThermoChemistry by UtaReuter96 (510 points)

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Calculate the enthalpy of solution (in kJ/mol) for dissolving 10.0 g of NaOH(s) in 100.0 g of water at 25°C, given that the final temperature of the solution is 28.5°C and the heat capacity of the solution is 4.18 J/g°C.

asked Jan 23 in ThermoChemistry by CarrieGabel2 (510 points)

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Calculate the enthalpy of reduction for the reaction: Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)given that the standard enthalpy of formation of Fe2O3(s), CO(g), and CO2(g) are -824kJ/mol, -110.5kJ/mol, and -393.5kJ/mol respectively. Assume all reactants and products are in their standard states.

asked Jan 23 in ThermoChemistry by DominickCadw (480 points)

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Calculate the enthalpy of reduction for Fe2O3 given that it is reduced to FeO by hydrogen at 298K and constant pressure. Given that the standard enthalpy of formation of Fe2O3 and FeO are -822kJ/mol and -272kJ/mol respectively, the heat of combustion of hydrogen is -286kJ/mol and the enthalpy of formation of H2O is -285.8kJ/mol.

asked Jan 23 in ThermoChemistry by BradTomholt (570 points)

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Calculate the enthalpy of precipitation when 50.0 mL of 0.200 M BaCl2(aq) is added to 30.0 mL of 0.150 M Na2SO4(aq).

asked Jan 23 in ThermoChemistry by MargaretaWil (290 points)

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Calculate the enthalpy of polymerization of styrene given that the enthalpy change for the addition of one mole of styrene is -32 kJ/mol and the polymerization involves the addition of 50 monomer units. Assume that all the enthalpy change is due to polymerization and the reaction is exothermic.

asked Jan 23 in ThermoChemistry by CandraDawbin (530 points)

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Calculate the enthalpy of polymerization of ethylene from the following data: Ethylene, C2H4(g) polymerizes to form polyethylene, (C2H4)n(s) with ΔHrxn = -44.0 kJ/mol at 298 K. Additionally, it is known that the standard enthalpies of formation of C2H4(g) and polyethylene (C2H4)n(s) are 52.3 kJ/mol and -128.2 kJ/mol, respectively. Assuming the enthalpy of polymerization is independent of temperature, calculate ΔHºp for the reaction.

asked Jan 23 in ThermoChemistry by MaggieSpradl (500 points)

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Calculate the enthalpy of polymerization for the synthesis of polyethylene from its monomer using the given data:- Standard enthalpy of formation of ethylene (C2H4) = +52.3 kJ/mol- Standard enthalpy of formation of polyethylene (-[-CH2-]n-) = -256 kJ/mol

asked Jan 23 in ThermoChemistry by JasperThacke (510 points)

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Calculate the enthalpy of polymerization for the reaction of ethylene (C2H4) to polyethylene (C2H4)n, given that the enthalpy of combustion for ethylene is -1411 kJ/mol and the number of moles of ethylene used in the reaction is 4.5 mol. Assume that the reaction is exothermic and that the enthalpy change is constant over the extent of the reaction.

asked Jan 23 in ThermoChemistry by KalaMoriarty (450 points)

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Calculate the enthalpy of polymerization for the formation of polyethylene from its monomer, ethylene, given the following information:- The enthalpy of formation for ethylene is -84.7 kJ/mol.- The enthalpy of combustion for ethylene is -1410.1 kJ/mol.- The enthalpy of combustion for polyethylene is -5115.0 kJ/mol.- The molar mass of ethylene is 28.05 g/mol, and the molar mass of polyethylene is 28,000 g/mol (assume the polymer has an average degree of polymerization of 1000).

asked Jan 23 in ThermoChemistry by AngleaLongwe (180 points)

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Calculate the enthalpy of oxidation of methane gas in kJ/mol if the reaction produces carbon dioxide gas and water vapor, and the enthalpy changes for the following reactions are known: - Enthalpy change of combustion of methane = -890.3 kJ/mol - Enthalpy change of formation of carbon dioxide = -393.5 kJ/mol - Enthalpy change of formation of water vapor = -241.8 kJ/mol

asked Jan 23 in ThermoChemistry by LLIRhys20886 (310 points)

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Calculate the enthalpy of oxidation of methane gas (CH4) at standard conditions given the following information:- Enthalpy of formation of CH4 = -74.8 kJ/mol- Enthalpy of formation of H2O = -285.8 kJ/mol- Enthalpy of formation of CO2 = -393.5 kJ/mol

asked Jan 23 in ThermoChemistry by NewtonKirch (390 points)

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Calculate the enthalpy of oxidation of methane gas ($CH_4$) when it is burned completely in the presence of excess oxygen gas ($O_2$), given that the standard enthalpy of formation of $CH_4$ is -74.8 kJ/mol and the standard enthalpy of formation of $H_2O$ is -285.8 kJ/mol.

asked Jan 23 in ThermoChemistry by RozellaBranc (350 points)

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Calculate the enthalpy of oxidation for the reaction of 2 moles of magnesium (Mg) with 1 mole of oxygen gas (O2) under standard conditions. Given the standard enthalpy of formation (ΔH°f) of MgO is -601.8 kJ/mol.

asked Jan 23 in ThermoChemistry by Ursula933014 (410 points)

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Calculate the enthalpy of isomerization for the reaction of cis-2-butene to its trans counterpart. Given the following information: - Heat of combustion of cis-2-butene = -3338.9 kJ/mol- Heat of combustion of trans-2-butene = -3478.6 kJ/mol- Heat of combustion of butane = -2877.2 kJ/mol

asked Jan 23 in ThermoChemistry by SiennaFowler (390 points)

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Calculate the enthalpy of isomerization for butene to isobutene given the following bond dissociation energies (in kJ/mol): C-C = 345, C=C = 614, C-H = 413.

asked Jan 23 in ThermoChemistry by ClariceScott (590 points)

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1 answer 42 views

Calculate the enthalpy of ionization of magnesium using the following data: the first ionization energy of Mg is 738 kJ/mol and the lattice energy of MgCl₂ is -2495 kJ/mol.

asked Jan 23 in ThermoChemistry by RonnyMakin32 (570 points)

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