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Lecture 18

CHEM10003 Lecture Notes - Lecture 18: Bond-Dissociation Energy, Molar Mass, Stoichiometry


Department
Chemistry
Course Code
CHEM10003
Professor
Guy Jameson
Lecture
18

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Lecture 18: Energy and Thermochemistry
Measuring energy changes
Bomb calorimeter
Solution calorimeter ‘coffee cup’
Open to environment so there is a constant pressure

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Hess’s law
The total enthalpy change for a chemical reaction is independent of the path by which
the reaction occurs provided the starting and finishing states are the same for each
reaction path
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Enthalpy changes
Corresponds to the standard enthalpy of reaction for the formation of one mole
of ___ in its standard state (for CO2 this is its gas phase) from its constituent elements in
their standard state.
Enthalpy of formation
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