Standard enthalpy changes

Question	Answer
Standard conditions	1 atmosphere and 298K
Standard enthalpy change of reaction	The enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states
Standard enthalpy change of combustion	The enthalpy change that takes place when 1 mole of a substance reacts completely with oxygen under standard conditions, all reactants and products being in their standard states
Standard enthalpy change of formation	The enthalpy change that takes place when 1 mole of a compound is formed from its constituent elements in their standard states under standard conditions
Standard state	The physical state of a substance under standard conditions
Moles(n)=	Mass(m) / Molar mass(M)
Bond enthalpy	The enthalpy change that takes place when breaking by homolytic fission 1 mole of a given bond in the molecules of a gaseous species
Average bond enthalpy	The average enthalpy change that takes place when breaking by homolytic fission 1 mole of a given type of bond in the molecules of a gaseous species
Hess' law states that	If a reaction can take place by more than one route and the initial and final conditions are the same, the total enthalpy change is the same for each route

Resource summary

	Created by leigh.smith over 10 years ago