Recent questions in Chemistry

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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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1 answer 54 views

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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1 answer 60 views

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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1 answer 55 views

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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1 answer 51 views

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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1 answer 52 views

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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1 answer 43 views

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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1 answer 46 views

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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1 answer 40 views

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 47 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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1 answer 62 views

Calculate the enthalpy of ionization of magnesium if 50 mL of 0.1 M HCl solution is added to 1 g of magnesium powder at 25°C, and the change in temperature is -10°C. The specific heat capacity of the solution is 4.18 J•g-1•K-1.

asked Jan 23 in ThermoChemistry by JuliannLeSou (630 points)

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1 answer 46 views

Calculate the enthalpy of ionization of magnesium if 4.8 g of magnesium reacts completely with hydrochloric acid to form 224 mL of hydrogen gas at standard temperature and pressure (STP). The heat released during the reaction is -412 kJ/mol.

asked Jan 23 in ThermoChemistry by DarbyReis18 (650 points)

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1 answer 38 views

Calculate the enthalpy of ionization of hydrogen gas (H₂) given that it requires 1312 kJ/mol to ionize a single hydrogen atom (H) in the gas phase.

asked Jan 23 in ThermoChemistry by DarbyManske (570 points)

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1 answer 45 views

Calculate the enthalpy of ionization of hydrogen atom from hydrogen molecule given that the bond dissociation enthalpy of H2 is 432 kJ/mol and the electron affinity of H atom is -72.8 kJ/mol.

asked Jan 23 in ThermoChemistry by AlisonAkers2 (550 points)

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1 answer 53 views

Calculate the enthalpy of ionization for the reaction Mg(g) → Mg⁺(g) + e⁻ given that the ionization potential of Mg is 735 kJ/mol and the electron affinity of Mg⁺ is -195 kJ/mol.

asked Jan 23 in ThermoChemistry by InaLewers025 (330 points)

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1 answer 38 views

Calculate the enthalpy of ionization for sodium ion (Na+) given that the first ionization energy of sodium (Na) is 495.8 kJ/mol and the second ionization energy is 4562 kJ/mol.

asked Jan 23 in ThermoChemistry by TammyChapdel (250 points)

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