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Calculate the enthalpy of desorption of hydrogen gas (H2) from a platinum surface, given that the temperature of the surface is 298 K and the pressure of H2 gas above the surface is 1 atm. The adsorption enthalpy of H2 on Pt is -43300 J/mol. (Assume ideal gas behavior for H2.)

asked Jan 23 in ThermoChemistry by TahliaEvatt8 (2.2k points)

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Calculate the enthalpy of desorption of CO2 from sodium hydroxide (NaOH) pellets given the following information: - The heat of absorption of CO2 by NaOH pellets is -20.9 kJ/mol.- The standard enthalpy of formation of Na2CO3 is -1130 kJ/mol.- The standard enthalpy of formation of water is -286 kJ/mol.- The standard enthalpy of formation of NaOH is -425 kJ/mol. Assuming that the desorption process is the reverse of the absorption process, determine the enthalpy change for the reaction: Na2CO3(s) + H2O(l) → 2NaOH(s) + CO2(g).

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

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Calculate the enthalpy of desorption of carbon dioxide (CO2) from a surface if the surface coverage is 0.025 mol/m² and the temperature is 298 K. The enthalpy of adsorption for CO2 on the surface is -35.8 kJ/mol. The equilibrium constant (K) for the reaction is 2.99 x 10⁶ at 298 K.

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

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1 answer 107 views

Calculate the enthalpy of desorption for water vapor adsorbed on activated carbon, given that the heat of adsorption is -50 kJ/mol and the boiling point of water is 100°C.

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

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1 answer 121 views

Calculate the enthalpy of desorption for water molecules from the surface of a silica gel at a temperature of 25°C using the following information:- The vapor pressure of water at 25°C is 3.17 kPa.- The surface area of the silica gel is 25 cm².- The mass of the silica gel used in the experiment is 2.5 g.

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

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1 answer 104 views

Calculate the enthalpy of desorption for the process of magnesium oxide (MgO) surface drying at a temperature of 500 K, given that the equilibrium pressure of water vapor above the dried MgO is 0.056 atm and the enthalpy of adsorption of water on MgO is -44.48 kJ/mol.

asked Jan 23 in ThermoChemistry by KarolinBalse (1.5k points)

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1 answer 118 views

Calculate the enthalpy of combustion of methane if 2.56 g of methane was burnt completely in a bomb calorimeter containing excess oxygen, causing a temperature rise of 4.58 °C in the calorimeter, which has a heat capacity of 1.26 kJ/°C. The balanced chemical equation for the combustion of methane is as follows: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) + energy.

asked Jan 23 in ThermoChemistry by MaxwellDuff3 (1.9k points)

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1 answer 98 views

Calculate the enthalpy of combustion of methane gas (CH4), given that the heat released when 1.0 g of methane completely burns in excess oxygen is -890 kJ.

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

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Calculate the enthalpy of combustion of ethanol (C2H5OH) if 45.1 g of ethanol is burned completely in excess oxygen, producing 145.5 kJ of heat energy.

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

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Calculate the enthalpy of combustion of ethane (C2H6) using the following information: The enthalpy of formation of C2H6 is -84.7 kJ/mol, the enthalpy of formation of CO2 is -393.5 kJ/mol, and the enthalpy of formation of H2O is -241.8 kJ/mol.

asked Jan 23 in ThermoChemistry by Carole803671 (1.8k points)

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1 answer 116 views

Calculate the enthalpy of combustion of butane (C4H10) in kJ/mol given that its heat of formation value is -126.6 kJ/mol and the heat of formation values of CO2 and H2O are -393.5 kJ/mol and -241.8 kJ/mol, respectively.

asked Jan 23 in ThermoChemistry by Karine04K24 (2.0k points)

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1 answer 94 views

Calculate the enthalpy of combustion for sucrose (C₁₂H₂₂O₁₁) given that 5.25 g of sucrose were burned in a bomb calorimeter and the temperature rose by 2.75 °C. The heat capacity of the calorimeter is 20.45 kJ/°C.

asked Jan 23 in ThermoChemistry by IWHJaxon1452 (2.1k points)

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1 answer 117 views

Calculate the enthalpy of adsorption when 2.5 grams of hydrogen gas is adsorbed onto a surface at a temperature of 298 K. The equilibrium pressure of hydrogen gas at this temperature is 1.5 atm and the surface area of the adsorbent is 50 cm². (Assume ideal gas behavior and that the adsorption occurs under standard conditions.)

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

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1 answer 100 views

Calculate the enthalpy of adsorption when 2.0 grams of activated charcoal adsorbs 25 mL of methane gas at a constant temperature of 298 K, given that the pressure is 1 atm. Assume ideal gas behavior for methane.

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

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1 answer 109 views

Calculate the enthalpy of adsorption of nitrogen gas on the surface of activated charcoal at 298 K, given that the equilibrium pressure of nitrogen is 8.5 x 10^-3 atm and the surface area of the charcoal is 1200 m^2/g.

asked Jan 23 in ThermoChemistry by MaynardErb58 (2.0k points)

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1 answer 82 views

Calculate the enthalpy of adsorption of methane gas on activated charcoal at room temperature (25°C) given the following information:- The saturation pressure of methane at 25°C is 3.78 MPa.- The surface area of activated charcoal used is 100 m²/g.- The amount of methane adsorbed on the activated charcoal is 5 mmol/g.

asked Jan 23 in ThermoChemistry by IvyHogan8844 (1.6k points)

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Calculate the enthalpy of adsorption of hydrogen gas on platinum at 298 K, given that the maximum coverage of hydrogen on the platinum surface is 0.5 monolayers and the equilibrium constant for the process at 298 K is 2.5 x 10^3. Assume that the adsorption process is exothermic and that the standard enthalpy of formation of water is -286 kJ/mol.

asked Jan 23 in ThermoChemistry by YOKIva496594 (2.6k points)

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1 answer 93 views

Calculate the enthalpy of adsorption of hydrogen gas on activated carbon if 2 grams of activated carbon absorb 0.025 moles of hydrogen gas at 298 K and the pressure of the system is 1 atm. The molar enthalpy of hydrogen gas is -285.8 kJ/mol at constant pressure.

asked Jan 23 in ThermoChemistry by MaxwellDuff3 (1.9k points)

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1 answer 109 views

Calculate the enthalpy of adsorption of benzene vapor on silica gel at 25°C and a pressure of 2.0 atm, given that the mass of adsorbent used is 0.25 g and the adsorption capacity of silica gel for benzene at this temperature and pressure is 0.75 g/g.

asked Jan 23 in ThermoChemistry by Latonya89F54 (2.2k points)

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Calculate the enthalpy of adsorption of 1 mole of hydrogen gas on the surface of activated charcoal from the given data:- The heat of combustion of hydrogen gas at constant volume is -285.8 kJ/mol- The heat of combustion of hydrogen gas at constant pressure is -241.8 kJ/mol- The heat of vaporization of hydrogen gas at its boiling point (20.3 K) is 0.452 kJ/mol- The surface area of activated charcoal is 500 m²/g- The weight of activated charcoal used is 0.5 g.

asked Jan 23 in ThermoChemistry by BradConger9 (1.8k points)

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