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3 cards from this section. Quick, good the night before a test.
Define standard enthalpy of formation.
Think about the formation process from elements.
What is the heat of reaction formula?
Look for the roles of products and reactants.
What does ΔHf0 represent?
Focus on the formation process of compounds.
The heat of reaction is calculated as?
Consider what happens to heat during a reaction.
Calculate the standard enthalpy of the combustion of octane (C8H18), given the following: ΔHf for CO2 is -393.5 kJ/mol, ΔHf for H2O is -241.8 kJ/mol, and ΔHf for octane is -249.9 kJ/mol.
Ensure you have balanced the combustion equation first.
Discuss how variations in temperature impact sensible enthalpy in a combustion reaction and hence the overall energy balance.
Consider how energy states change with temperature.
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