CH9 enthalpy

What are the standard conditions for enthalpy change

Pressure= 100kPa

Temp= 298k

Concentration= 1moldm-3

Enthalpy change of formation

The enthalpy change that takes place when one mole of a compound is formed from its elements under standard conditions with all reactants and products in their standard states

Enthalpy change of combustion

The enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions with all reactants and products in their standard states

Enthalpy change of reaction

The enthalpy change that accompanies reaction in molar quantities shown in a chemical equation under standard conditions with all reactants and products in their standard states.

Enthalpy change of neutralisation

The energy change that accompanies the reaction of an acid by a base to form one mole of water under standard conditions with all reactants and products i their standard states.

Equation for calculating energy change

Q=mc(delta)T

What is average bond enthalpy

The energy required to break one mole of a specified type of bond in a gaseous molecule.

Why are some bond enthalpies different for the same type of bond?

The bond is different in different environments