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51 solutions

Enthalpy of Formation

Q. Calculate the enthalpy of combustion of butane, C4H10(g) for the formation of H2O(g) and CO2(g). The enthalpy of formation of butane is −126 kJ/mol.

Solved • Aug 16, 2019

Enthalpy of Formation

Q. Witherite is a mineral which is composed mainly of barium carbonate (BaCO3). When heated, this compound decomposes to form barium oxide and carbon dioxide, as expressed by the following equation. BaCO3(s) -> BaO(s) + CO2(g) The standard enthalpy change for this reaction is +271.5 kJ/mol, and the standard enthalpies of formation of BaCO3(s) and BaO(s) are given in the table below. Compound: Enthalpy of formation (kJ/mol) BaCO3(S): -1213.0 BaO(s): -548.0 (a) Calculate the standard enthalpy of formation of CO2(g). (b) Calculate the standard enthalpy change for the reverse reaction.

Solved • Jul 18, 2019

Enthalpy of Formation

Q. Consider the following chemical equation. CH4(g) + 2 O2(g) -> CO2(g) + 2 H2O(g) Calculate ΔH for the reaction using the bond enthalpies given.

Solved • Jul 18, 2019

Enthalpy of Formation

Q. The standard enthalpy change for the reaction SO2(g) + 1/2 O2(g) -> SO3(g) is -98 kJ/mol. Calculate the standard enthalpy of formation of SO3(g) given ΔHf° for SO2(g) is -296.8 kJ/mol.

Solved • Jul 18, 2019

Enthalpy of Formation

Q. The change in enthalpy of solution (ΔHsolution) after two liquids are mixed is -94.5 kJ/mol. Use the equation and values provided to determine the energy released by the solute-solvent interaction (ΔH3). ΔHsolution = ΔH1 + ΔH2 + ΔH3 solute-solvent interaction (ΔH1) = +291.1 kJ/mol solvent-solvent interaction (ΔH2) = +561.3 kJ/mol

Solved • Jul 18, 2019

Enthalpy of Formation

Q. The combustion of propane produces carbon dioxide and water, as shown in the equation below. C3H8(g) + 5 O2(g) -> 3 CO2(g) + 4H2O(g) Calculate the overall enthalpy change for this reaction using the bond enthalpies given.

Solved • Jul 18, 2019

Enthalpy of Formation

Q. Isobutene can react with hydrogen to form isobutane as follows: C4H8(g) + H2(g) -> C4H10(g) Using the bond enthalpies given in the table, calculate the enthalpy change for this reaction.

Solved • Jul 18, 2019