Enthalpy Flashcards
What is the definition for the standard enthalpy of combustion?
The enthalpy change when one mole of a substance is burned completely in oxygen all substances in normal states under standard conditions.
What is the definition for the standard enthalpy of formation?
The enthalpy change when one mole of a compound is formed from its elements in their standard states.
What are the most common errors in a calorimetry experiment?
Heat loss
Incomplete combustion
What is Hess’s Law?
Hess’s law states that the enthalpy change for a chemical reaction is the same, whatever route is taken from reactants to products.
What is the equation for enthalpy change?
Enthalpy change = mass of substance x specific heat capacity x temperature change
How can the enthalpy of combustion be worked out?
Using enthalpy of formation for the products and reactants.
What is meant by the term enthalpy change?
When you measure a heat change at constant pressure.
