Recent questions in Chemistry

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Calculate the enthalpy of formation of water (H2O) given the enthalpies of formation of hydrogen gas (H2) and oxygen gas (O2) are -286 kJ/mol and 0 kJ/mol, respectively.

asked Jan 23 in ThermoChemistry by Diana7095427 (350 points)

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Calculate the enthalpy of formation of sodium chloride from its constituent elements, given the following thermochemical equations:2Na (s) + 1/2 O2 (g) -> Na2O (s) ΔH° = -414.1 kJ/mol Na2O (s) + 1/2 Cl2 (g) -> NaCl (s) ΔH° = -411.2 kJ/mol

asked Jan 23 in ThermoChemistry by JanaNye81690 (490 points)

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Calculate the enthalpy of formation of So₃(g) using the given thermochemical equations:2SO₂(g) + O₂(g) → 2SO₃(g) ∆H = -197 kJ/mol2SO₂(g) + 2O₂(g) → 2SO₃(g) ∆H = -792 kJ/mol

asked Jan 23 in ThermoChemistry by SYUEllis561 (490 points)

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Calculate the enthalpy of formation of NaCl(s) using the following information:1. The enthalpy change of formation of Na(g) is +108.5 kJ/mol.2. The enthalpy change of formation of Cl2(g) is 0 kJ/mol.3. The enthalpy change of vaporization of Na is +97.42 kJ/mol.4. The enthalpy change of dissociation of Cl2 is +242.76 kJ/mol.

asked Jan 23 in ThermoChemistry by BennieBrasse (830 points)

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Calculate the enthalpy of formation of carbon dioxide given the following data:C(s) + O2(g) → CO2(g) ΔH° = -393.5 kJ/molC(s) + 2H2(g) → CH4(g) ΔH° = -74.8 kJ/mol2H2(g) + O2(g) → 2H2O(l) ΔH° = -571.6 kJ/mol

asked Jan 23 in ThermoChemistry by ArdenQpv8725 (570 points)

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Calculate the enthalpy of formation for glucose (C6H12O6) at standard conditions, given the following enthalpies of formation for its constituent elements: C(graphite) = 0 kJ/mol H2(g) = 0 kJ/mol O2(g) = 0 kJ/mol Hint: Use Hess's Law and standard enthalpies of formation to solve the problem.

asked Jan 23 in ThermoChemistry by Holly81G1945 (610 points)

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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 FrancescaBid (490 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 MiaBettingto (310 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 IndianaDasil (310 points)

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1 answer 51 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 ClarissaBeac (370 points)

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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 MitchGunn31 (410 points)

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1 answer 55 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 KarriFoxall (210 points)

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1 answer 58 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 ValenciaCkw (390 points)

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1 answer 40 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 HunterCarawa (510 points)

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1 answer 52 views

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 Corazon66R68 (510 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 JulietSells6 (450 points)

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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 BonitaWaley (230 points)

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1 answer 49 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 CarmaDurden (430 points)

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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 DeboraPrenti (250 points)

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1 answer 48 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 FlynnO086966 (350 points)

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