What is the energy change per mole of lauric acid (C12H24O2) burned?
C12H24O2 + 17O2 ==> 12CO2 +12 H2O
Look up deltaHo, then
dHrxn = (n*dHo products) - (n*dHo reactants)
Post your work if you get stuck.
The energy change per mole of lauric acid (C12H24O2) burned can be determined using the reaction equation and standard enthalpies of formation. The balanced combustion equation for lauric acid is:
C12H24O2 + 16O2 → 12CO2 + 12H2O
The standard enthalpy of formation (ΔHf) for lauric acid is -751 kJ/mol, the standard enthalpy of formation of CO2 is -393.5 kJ/mol, and the standard enthalpy of formation of H2O is -241.8 kJ/mol.
To calculate the energy change per mole of lauric acid burned, we can use the following formula:
ΔH = ΣΔHf (products) - ΣΔHf (reactants)
ΔH = [12(-393.5) + 12(-241.8)] - [-751]
Simplifying the equation:
ΔH = -4722 kJ/mol - (-751 kJ/mol)
= -4722 kJ/mol + 751 kJ/mol
= -3971 kJ/mol
Therefore, the energy change per mole of lauric acid burned is -3971 kJ/mol. Note that the negative sign indicates that the reaction is exothermic, meaning it releases energy.
To determine the energy change per mole of lauric acid (C12H24O2) burned, you need to have the enthalpy of combustion for lauric acid, typically denoted as ΔHcombustion.
One way to determine this value would be to consult a reliable source such as a chemistry textbook, academic journals, or reputable online databases. These sources often provide the enthalpy values of combustion reactions for various compounds, including lauric acid.
If you have access to a database such as the National Institute of Standards and Technology (NIST) Chemistry WebBook or other scientific literature databases, you can search for the enthalpy of combustion for lauric acid. Using these databases, you can typically search by the compound name or its Chemical Abstracts Service (CAS) number.
Once you have obtained the enthalpy of combustion value (ΔHcombustion) for lauric acid, you can use it to calculate the energy change per mole. The energy change per mole (ΔE) can be calculated using the equation:
ΔE = ΔHcombustion / Moles of lauric acid burned
To use this equation, you would need to know the number of moles of lauric acid that are burned in the reaction. The balanced chemical equation for the combustion reaction of lauric acid will provide this information by comparing stoichiometric coefficients.
For example, if the balanced equation for the combustion of lauric acid is:
C12H24O2 + 18O2 -> 12CO2 + 12H2O
From the equation, the stoichiometric coefficient for lauric acid is 1, meaning one mole of lauric acid is burned in the reaction.
By substituting the values into the equation, you can calculate the energy change per mole of lauric acid burned.