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Calculate the HOMO-LUMO energy gap of a conjugated polymer with a repeating unit of poly(p-phenylene vinylene) (PPV) using quantum chemical methods (such as Density Functional Theory) and determine whether the polymer is expected to exhibit optoelectronic activity in the visible region of the electromagnetic spectrum.

asked Jan 23 in Quantum Chemistry by CandelariaFe (1.6k points)

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1 answer 65 views

Calculate the heat required to sublime 34.5 g of dry ice (solid CO2) at a constant temperature and pressure, given that the heat of sublimation of CO2 is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by Aline0805519 (1.8k points)

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Calculate the heat required to sublime 25 grams of dry ice (CO2) at a temperature of -78.5 °C if the enthalpy of sublimation is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by HIELucille73 (2.1k points)

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Calculate the heat required to sublime 20.0 grams of dry ice (solid carbon dioxide) at a temperature of -78.5 °C, given the heat of sublimation of CO2 is 25.2 kJ/mol.

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

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1 answer 68 views

Calculate the heat required to sublime 10 grams of dry ice (carbon dioxide) at its melting point (-78.5°C) and convert it to a gas at its boiling point (-57°C). The heat of sublimation of carbon dioxide is 25.2 kJ/mol.

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

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1 answer 77 views

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

asked Jan 23 in ThermoChemistry by XGJSidney76 (1.4k points)

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1 answer 62 views

Calculate the heat required to raise the temperature of 50 grams of water from 20°C to 80°C. The specific heat capacity of water is 4.184 J/g·°C.

asked Jan 23 in ThermoChemistry by Sung68J56969 (2.2k points)

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1 answer 75 views

Calculate the heat required to raise the temperature of 100.0 grams of water from 25°C to 50°C if the specific heat capacity of water is 4.184 J/g°C.

asked Jan 23 in ThermoChemistry by ReinaldoMunz (1.2k points)

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1 answer 64 views

Calculate the heat released when 50 ml of 0.1 M HCl is neutralized with 50 ml of 0.1 M NaOH, assuming that the specific heat capacity of the mixture is 4.18 J/g°C and the density of the final solution is 1.0 g/mL.

asked Jan 23 in ThermoChemistry by Hanna191905 (2.0k points)

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1 answer 81 views

Calculate the heat released when 300 mL of water at 20°C is mixed with 200 mL of ethanol at 25°C. The specific heat capacity of water is 4.18 J/g°C, the specific heat capacity of ethanol is 2.44 J/g°C, and the heat of mixing for water and ethanol is approximately -21 kJ/mol. Assume that both water and ethanol have a density of 1 g/mL and that the final temperature of the mixture is 22°C.

asked Jan 23 in ThermoChemistry by MorrisMcGahe (1.7k points)

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Calculate the heat released when 10.0 g of solid NaOH at 25.0°C is dissolved in 200.0 mL of water also at 25.0°C, given that the heat of crystallization of NaOH is 44.5 kJ/mol and the density of water is 1.00 g/mL.

asked Jan 23 in ThermoChemistry by DanClay0864 (2.1k points)

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1 answer 83 views

Calculate the heat released when 1 mole of ethane (C2H6) is combusted in oxygen gas to form carbon dioxide and water, given the following enthalpy of combustion values: ΔH°comb(C2H6) = -1560 kJ/mol ΔH°comb(O2) = -393.5 kJ/mol ΔH°f(CO2) = -393.5 kJ/mol ΔH°f(H2O) = -285.8 kJ/mol

asked Jan 23 in ThermoChemistry by GingerJ92570 (1.6k points)

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1 answer 88 views

Calculate the heat of sublimation of solid carbon dioxide (dry ice) given that the enthalpy of fusion of solid carbon dioxide is 8.6 kJ/mol and the enthalpy of vaporization of carbon dioxide gas is 22.8 kJ/mol. (Hint: The heat of sublimation of a substance is equal to the sum of its enthalpy of fusion and enthalpy of vaporization.)

asked Jan 23 in ThermoChemistry by Phillipp6306 (2.1k points)

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1 answer 92 views

Calculate the heat of sublimation of solid carbon dioxide (CO2) given that its enthalpy of fusion is 8.44 kJ/mol and its enthalpy of vaporization is 25.2 kJ/mol. The molar mass of CO2 is 44.01 g/mol.

asked Jan 23 in ThermoChemistry by HarryHodgkin (2.2k points)

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1 answer 86 views

Calculate the Heat of Sublimation of iodine (I2) if 20.0 grams of iodine sublimate at standard temperature and pressure (STP) from a solid to a gas phase absorbing 62.30 kJ of heat energy in the process.

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

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1 answer 70 views

Calculate the heat of sublimation for water when 10 g of ice sublimes at standard conditions (1 atm, 25°C)? Given: Heat of fusion of ice is 6.01 kJ/mol; Heat of vaporization of water is 40.67 kJ/mol.

asked Jan 23 in ThermoChemistry by ClaraCraddoc (1.6k points)

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1 answer 78 views

Calculate the heat of sublimation for iodine if 25 g of iodine is heated from its solid form at -110°C to its gaseous form at 184°C. The molar heat capacity of iodine (s) is 54.44 J mol⁻¹ K⁻¹ and the molar heat capacity of iodine (g) is 36.57 J mol⁻¹ K⁻¹. The molar enthalpy of fusion of iodine is 15.52 kJ mol⁻¹.

asked Jan 23 in ThermoChemistry by EmilySulman6 (2.0k points)

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1 answer 77 views

Calculate the heat of neutralization when 50 mL of 1 M HCl(aq) is mixed with 50 mL of 1 M NaOH(aq) at a constant temperature of 25 °C. The specific heat capacity 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 Hanna191905 (2.0k points)

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1 answer 59 views

Calculate the heat of neutralization for the reaction of 50 mL of 2.0 M hydrochloric acid and 50 mL of 2.0 M sodium hydroxide. The specific heat capacity of the solution is 4.18 J/g°C and the temperature change is 10°C.

asked Jan 23 in ThermoChemistry by JackQ7308746 (2.0k points)

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1 answer 77 views

Calculate the heat of mixing when 50g of ethanol (C2H5OH) is added to 200g of water initially at 25°C. Assume the density of water is 1g/mL and the specific heat capacity of water is 4.184J/(g°C). The enthalpy of vaporization of ethanol is 38.56kJ/mol and assume that ethanol-water mixture has a specific heat capacity of 4.2J/(g°C).

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

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