Calculate the approximate enthalpy change, ?Hrxn, for the combustion of one mole of methane a shown…
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Question “Calculate the approximate enthalpy change, ?Hrxn, for the combustion of one mole of methane a shown…”
Calculate the approximate enthalpy change, ?Hrxn, for the
combustion of one mole of methane a shown in the balanced chemical
equation: CH4+2O2?2H2O+CO2 Use the values you calculated in Parts
A, B, C, and D, keeping in mind the stoichiometric
coefficients.
delta H CH4=1656 kJ/mol
delta H O2=498 kJ/mol
delta H H2O=-928 kJ/mol
delta H CO2=-1598 kJ/mol
Answer
Concepts and Reason
Reactions to combustion:
A chemical reaction where an organic compound (or hydrocarbon) is burned with oxygen to form water or carbon dioxide is called the combustion reaction. Exothermic reactions are those in which heat is released in the form of energy.
Bond enthalpy
Bond enthalpy, one of the thermodynamic quantities, measures the bond strength of molecules (energy stored as a chemical bond). It is the energy required to break the chemical bonds within the molecules. This is also called average bond energy, or bond dissociation rate. It is often expressed in
.
Fundamentals
Below is the arbitrary response:
Here
,
were the reactants.
The product.
This formula can calculate the approximate enthalpy for the gas phase reaction:
Here
indicates bond dissociation energies of reactants
refers to the bond dissociation energie of products.
is the bond dissociation energy.
The coefficients of products and reactants are n and m in the formula.
Stoichiometric coefficients
A stoichiometric coeficient is a simple whole number used to determine relative moles and molecules in a balanced chemical formula.
Here’s how methane can be burned:
The above reaction results in methane being burned with oxygen to make carbon dioxide and water.
The following balanced chemical equation can be found:
The following equation can be used to calculate the change of enthalpy in the combustion reaction of one mole methane.
Substitute for the substance’s values.
Ans:
Hence, the approximate enthalpy change,
, for the combustion of one mole of methane is
.
Conclusion
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