Standard enthalpy changes Flashcards
What is the standard temperature?
298K
What is the standard pressure?
100kPa
What is the standard concentration?
1 mol dm⁻³
What is a standard state?
The most stable physical state of a substance under standard conditions - e.g. H2O (l)
What is standard enthalpy change of combustion?
The enthalpy change that takes place when one mole of substance reacts completely under standard conditions with all reactants and products being in their standard states
What is standard enthalpy change of formation?
The enthalpy change that takes place when one mole of a compound is formed from its constituent elements in their standard states under standard conditions
What is standard enthalpy change of neutralisation?
The enthalpy change that accompanies the reaction of an acid with a base to form one mole of water under standard conditions with all reactants and products in their standard states.
What is the symbol for standard enthalpy change of combustion?
ΔcH°
What is the symbol for standard enthalpy change of formation?
ΔfH°
What is the symbol for standard enthalpy change of neutralisation?
ΔneutH°
How do you calculate enthalpy changes using formation data?
Products - reactants
How do you calculate enthalpy changes using combustion data?
Reactants - products
