Standard enthalpy change of reaction
The
standard enthalpy change of reaction is the
enthalpy change that occurs in a system when 1 equivalent of matter is
transformed by a
chemical reaction under
standard conditions.
For a generic chemical reaction
- nA A + nB B + ... → nP P + nQ Q ...
the standard enthalpy change of reaction ΔH
r is related with the
standard enthalpy change of formation ΔH
f of the reactants and products by the equation