Concept explainers
Interpretation: The energy difference between the incomplete and complete combustion of one mole of methane is to be calculated.
Concept introduction: The energy which is required in a molecule to break one mole of a covalent bond in its gaseous phase is known as bond energy of that bond. It is expressed in terms of enthalpy change denoted by
To determine: The energy difference between the incomplete and complete combustion of one mole of methane.
Answer to Problem 8.131QP
The energy difference between the incomplete and complete combustion of one mole of methane is
Explanation of Solution
Explanation
The reaction for incomplete combustion of methane is,
The change in enthalpy for the given reaction is calculated by using the formula,
Bond energy of a
Bond energy of a
Bond energy of a
Bond energy of a
Substitute the value of average bond energies of
Simplify the above equation,
The change in enthalpy for two moles of methane is
Hence, the enthalpy of incomplete combustion of methane is
The equation for complete combustion of methane is,
The change in enthalpy for the given reaction is calculated by using the formula,
Bond energy of a
Bond energy of a
Bond energy of a
Bond energy of a
Substitute the value of average bond energies of
Simplify the above equation,
The change in enthalpy for one mole of methane is
Hence, the enthalpy of complete combustion of methane is.
The difference between the enthalpy of complete combustion of methane and the incomplete combustion of methane is,
Hence, the incomplete combustion reaction releases
The energy difference between the incomplete and complete combustion of one mole of methane is
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Chapter 8 Solutions
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